S20FE 5GHz WiFi speed issues

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piotrekbx

New member
Aug 11, 2021
3
3
Hi,

I'm trying to resolve my WiFi problems on Samsung S20 FE 5G. When I download large files (games, updates, big apps) WiFi speed drops from 300 Mbps (that's my provider speed) to < 10 Mbps or even completely stops. It happens after a few minutes of download (sometimes less) - the estimated download time goes from few minutes to few hours. If I continue to download speed usually goes up again after another few minutes. Or I can restart wifi/put phone in airplane mode/restart it - it restores normal WiFi speed.
What I've already tried but didn't help:
- reset phone network settings
- reset router to factory settings and tried changing some of its options
- changed WiFi channel
- checked in safe mode of the phone
- tried without my silicone case on the back of the phone (as it might be some overheating issue)
- set my WiFi network as unmeasured in the phone settings (don't know really if that's the correct name of this setting in English)
- set WiFi connection to use phone MAC address instead of random one
- disabled automatic switching to mobile data when wifi connection quality is poor
- update the phone to latest August version (Android 11)
- wipe cache partition
- turned on enchanced processing

On other devices in my network connection is stable with 300 Mbps - checked with Speedtest.net. On 2.4 GHz WiFi problem also occur but only sometimes - on 5 GHz it happens every time. I also didn't notice it on LTE.

It seems that it might be some overheating issue so I've installed CPU monitor to check it - during download temperature went up from 30 Celsius degrees to over 50, then the connection speed dropped, temperature went down to about 40 degrees Celsius and after some time the speed increased again.

Is there any thing I can also do before returning phone to Samsung service?
 
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_jis_

Senior Member
Feb 5, 2012
1,469
530
Test your phone to see how it behaves on someone else's wi-fi network.
 

piotrekbx

New member
Aug 11, 2021
3
3
I've checked it on 5GHz WiFi hotspot from another phone and speed throttling didn't occur, although the connection speed was about 40 Mbps. Later I've checked it on two different routers connected to my network and speed dropped multiple times. So it appears that the problem of WiFi speed throttling occurs only on faster connections, even if other devices connected to same network have no such problems
 

chromaniac

Member
Oct 2, 2021
24
4
Gurgaon, India
Alright. So I got my unit today here in India. It's manufactured in India and is from September 2021 batch. And the first thing I noticed was that apps were downloading incredibly slow. After the phone was set up and fully charged. I did a speedtest, and I noticed that I was barely getting 10% of my connection speed. The phone was warm at this point of time. Left it for an hour. And wireless problems seem to be resolved.

It would be pretty annoying if this is definitely a throttling issue when the phone is warm. And this seems to be the only thread with this issue on XDA. There is no easy way to get a replacement unit. Amazon would send a tech person to my place and I would have to replicate the same situation to see if the throttling happens again. And entire process would be pointless if this is something by design.
 

Nevin jesmon

Member
Jun 24, 2018
37
4
KOCHI
Alright. So I got my unit today here in India. It's manufactured in India and is from September 2021 batch. And the first thing I noticed was that apps were downloading incredibly slow. After the phone was set up and fully charged. I did a speedtest, and I noticed that I was barely getting 10% of my connection speed. The phone was warm at this point of time. Left it for an hour. And wireless problems seem to be resolved.

It would be pretty annoying if this is definitely a throttling issue when the phone is warm. And this seems to be the only thread with this issue on XDA. There is no easy way to get a replacement unit. Amazon would send a tech person to my place and I would have to replicate the same situation to see if the throttling happens again. And entire process would be pointless if this is something by design.
I have the same issue and amazon has issued an end to end replacement for me I'm from India how's your device now all fine? have you tried resetting the device?
 

rohan1310

New member
May 12, 2014
4
0
Alright. So I got my unit today here in India. It's manufactured in India and is from September 2021 batch. And the first thing I noticed was that apps were downloading incredibly slow. After the phone was set up and fully charged. I did a speedtest, and I noticed that I was barely getting 10% of my connection speed. The phone was warm at this point of time. Left it for an hour. And wireless problems seem to be resolved.

It would be pretty annoying if this is definitely a throttling issue when the phone is warm. And this seems to be the only thread with this issue on XDA. There is no easy way to get a replacement unit. Amazon would send a tech person to my place and I would have to replicate the same situation to see if the throttling happens again. And entire process would be pointless if this is something by design.
Facing the exact same issue. Have you managed to find a fix?

My network speed is around 230 mbps down and 28 mbps up, also have a Wi-Fi 6 Mesh router, all my devices including my previous phone get the correct speeds. Just got my S20FE today and it throttles down to 10-15 mbps...rebooted once and saw 200+ but goes back to slow speeds in no time.
 

Nevin jesmon

Member
Jun 24, 2018
37
4
KOCHI
Facing the exact same issue. Have you managed to find a fix?

My network speed is around 230 mbps down and 28 mbps up, also have a Wi-Fi 6 Mesh router, all my devices including my previous phone get the correct speeds. Just got my S20FE today and it throttles down to 10-15 mbps...rebooted once and saw 200+ but goes back to slow speeds in no time.
Tried resetting? I'm gonna reset it very soon! btw what's the mgf date?.. Mine is Sept 2021
 

chromaniac

Member
Oct 2, 2021
24
4
Gurgaon, India
amazon has issued an end to end replacement for me
Have you received the replacement unit? If yes, is this unit fine? Amazon is not issuing a direct replacement for me. They assigned a third party tech guy to visit me who closed my complaint without waiting for my feedback. I have managed to get another visit assigned but that adds 2 more days to the process and if nothing happens on that day, my replacement window would be very close.

Have you managed to find a fix?
Nope. I am trying to find out if this is a hardware issue or samsung is throttling wifi massively on this phone and a firmware update could possibly fix this. But since this phone is already nearly a year old, it seems unlikely that they messed it up in September update and that's why we are facing this issue.

Mine is also from September 2021 assembled in India. What a mess. I still have my S10 Lite with me and wi-fi performance on that phone is incredibly stable compared to this phone.
 

Nevin jesmon

Member
Jun 24, 2018
37
4
KOCHI
Have you received the replacement unit? If yes, is this unit fine? Amazon is not issuing a direct replacement for me. They assigned a third party tech guy to visit me who closed my complaint without waiting for my feedback. I have managed to get another visit assigned but that adds 2 more days to the process and if nothing happens on that day, my replacement window would be very close.


Nope. I am trying to find out if this is a hardware issue or samsung is throttling wifi massively on this phone and a firmware update could possibly fix this. But since this phone is already nearly a year old, it seems unlikely that they messed it up in September update and that's why we are facing this issue.

Mine is also from September 2021 assembled in India. What a mess. I still have my S10 Lite with me and wi-fi performance on that phone is incredibly stable compared to this phone.
Try resetting it then it might fix the issue 😁
 

chromaniac

Member
Oct 2, 2021
24
4
Gurgaon, India
Would do in a couple of hours. It's just annoying that Amazon would not offer a replacement for manufacturing fault within the first week of purchase as per their own policy. And is forcing me to deal with third party outlets who are not going to understand the wi-fi stability issue on this device. They have a stupid app that tests phone and of course, it found my phone properly functional.
 

Nevin jesmon

Member
Jun 24, 2018
37
4
KOCHI
Would do in a couple of hours. It's just annoying that Amazon would not offer a replacement for manufacturing fault within the first week of purchase as per their own policy. And is forcing me to deal with third party outlets who are not going to understand the wi-fi stability issue on this device. They have a stupid app that tests phone and of course, it found my phone properly functional.
Dude call them don't use that ****ty app to find the issue request a call directly rn!
 
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chromaniac

Member
Oct 2, 2021
24
4
Gurgaon, India
I usually get good support through chat. And the technician visits have all been processed through customer care chat. I guess I would try phone support now.
 

chromaniac

Member
Oct 2, 2021
24
4
Gurgaon, India
heh. phone support guy said that since i already have a tech visit scheduled on 6th, he cannot do anything right now. but he assured me that if that visit does not create a replacement request, i should contact phone support again and they would it from their end. this whole thing is turning into a joke though.

i would do a reset tonight. and test the phone thoroughly through tomorrow. i was just hoping to find someone here who bought the phone during the current sale and got a unit that seems to have stable wi-fi on their phone. because that would indicate hardware fault and not something samsung messed up in their firmware update.

would keep you posted. and please you also update when you get your replacement unit and if it has the same issue or not! cheers.
 

Nevin jesmon

Member
Jun 24, 2018
37
4
KOCHI
heh. phone support guy said that since i already have a tech visit scheduled on 6th, he cannot do anything right now. but he assured me that if that visit does not create a replacement request, i should contact phone support again and they would it from their end. this whole thing is turning into a joke though.

i would do a reset tonight. and test the phone thoroughly through tomorrow. i was just hoping to find someone here who bought the phone during the current sale and got a unit that seems to have stable wi-fi on their phone. because that would indicate hardware fault and not something samsung messed up in their firmware update.

would keep you posted. and please you also update when you get your replacement unit and if it has the same issue or not! cheers.
Okay Done ! I'll keep you updated 🥰
 

Nevin jesmon

Member
Jun 24, 2018
37
4
KOCHI
heh. phone support guy said that since i already have a tech visit scheduled on 6th, he cannot do anything right now. but he assured me that if that visit does not create a replacement request, i should contact phone support again and they would it from their end. this whole thing is turning into a joke though.

i would do a reset tonight. and test the phone thoroughly through tomorrow. i was just hoping to find someone here who bought the phone during the current sale and got a unit that seems to have stable wi-fi on their phone. because that would indicate hardware fault and not something samsung messed up in their firmware update.

would keep you posted. and please you also update when you get your replacement unit and if it has the same issue or not! cheers.
BTW I currently don't face any issues with WiFi but sometimes it slows down to 6,10 Mbps which is really annoying 😭
 

viv29

Senior Member
Jul 3, 2018
118
106
I have the same issue. Phone is manufactured in September 2021, it randomly throttles on WiFi, especially when the device gets a little warm. I have tried factory resetting as well, but it seems to be of no use. If someone got their replacement unit and that is fine, please do let us know here, seems like a lot of people are facing the same issue!
 

chromaniac

Member
Oct 2, 2021
24
4
Gurgaon, India
yeah. the throttling of wireless connectivity is really annoying. i noticed it when the phone took almost an hour to restore the phone. i am on a 300mbps connection and it really shouldn't have taken that long. checked wifi settings and saw that it was connected at 15mbps. downloading telegram took around 5 minutes which is when i realized that something was terribly wrong.
 

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  • 2
    Hi,

    I'm trying to resolve my WiFi problems on Samsung S20 FE 5G. When I download large files (games, updates, big apps) WiFi speed drops from 300 Mbps (that's my provider speed) to < 10 Mbps or even completely stops. It happens after a few minutes of download (sometimes less) - the estimated download time goes from few minutes to few hours. If I continue to download speed usually goes up again after another few minutes. Or I can restart wifi/put phone in airplane mode/restart it - it restores normal WiFi speed.
    What I've already tried but didn't help:
    - reset phone network settings
    - reset router to factory settings and tried changing some of its options
    - changed WiFi channel
    - checked in safe mode of the phone
    - tried without my silicone case on the back of the phone (as it might be some overheating issue)
    - set my WiFi network as unmeasured in the phone settings (don't know really if that's the correct name of this setting in English)
    - set WiFi connection to use phone MAC address instead of random one
    - disabled automatic switching to mobile data when wifi connection quality is poor
    - update the phone to latest August version (Android 11)
    - wipe cache partition
    - turned on enchanced processing

    On other devices in my network connection is stable with 300 Mbps - checked with Speedtest.net. On 2.4 GHz WiFi problem also occur but only sometimes - on 5 GHz it happens every time. I also didn't notice it on LTE.

    It seems that it might be some overheating issue so I've installed CPU monitor to check it - during download temperature went up from 30 Celsius degrees to over 50, then the connection speed dropped, temperature went down to about 40 degrees Celsius and after some time the speed increased again.

    Is there any thing I can also do before returning phone to Samsung service?
    2
    He claims to not have such issues. He's running the latest update as well, so I'm leaning towards believing that this is not a software issue. Anyways, I got a direct replacement booked by calling Amazon (thanks for the heads up, I'd have had to deal with the technician if done through app)

    Hoping this doesn't occur on the replacement unit. Other than this issue I've really come to like the phone. Fingers crossed!
    1
    Would do in a couple of hours. It's just annoying that Amazon would not offer a replacement for manufacturing fault within the first week of purchase as per their own policy. And is forcing me to deal with third party outlets who are not going to understand the wi-fi stability issue on this device. They have a stupid app that tests phone and of course, it found my phone properly functional.
    Dude call them don't use that ****ty app to find the issue request a call directly rn!
    1
    when the device gets a little warm.
    yup. this is exactly what happened during the restore process. phone was on charge and it was restoring and updating around 100 apps. internet was extremely slow at the time.

    i have a feeling that this is a software issue. samsung is throttling wifi to save on battery or something. BUT. they have had almost a year to optimize wi-fi on this phone.

    october update might have a fix assuming they know about this issue. but it is currently available only in europe. it's unlikely india is getting it this week. would have been nice to test out wifi after installing it.
    1
    It's been very long since I logged into XDA, and probably too late for Amazon replacement. 😢

    This is my 1st affordable flagship phone and sad to see so many people facing this issue.

    I bought it in the same sale, 2 October midnight, delivered 5 October morning. It had August patch on it.

    BUT I just saw this thread only this morning.

    I don't use Wi-Fi internet, but I did order a TP-Link archer C60 AC1350 router for high-speed data transfer/offline streaming from my PC. It's not even shipped yet😬.

    Whenever I do get this router, I could check the issue for you guys.

    I did do a few file transfers over Wi-Fi with a different phone and my PC using hotspot, but honestly it neither took long enough, nor would it have been revealing even if it did (The PC adapter is bottlenecked by 150 mbps Wi-Fi n).

    If I may make a suggestion here, I'd say this: since all of you are saying this issue looks like throttling (initially speed is great, later it stumbles to a crawl, Temps get high), might it be a good idea to turn on "enhanced processing" option,and run the tests again? It's found in more battery settings (or you can search for those 2 words. I'll be attaching a screenshot anyway.)

    Perhaps that'd ignore artificial thermal limits imposed on wifi.

    Or maybe those of you willing to do it, could downgrade to One UI 2.5 and check it there as well?
    It's the same for me with enchanced processing and without it.