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Wifi disconnects and reconnects constantly

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PiCkLeS

Senior Member
Mar 30, 2006
408
170
Kristianstad
Samsung Galaxy Z Fold2
Hi,

just had the phone for an hour and almost right away after first setup the wifi radio disconnects/turns off and re-connects/turns on automatically every 20 seconds or so. No matter wich network I try.

Working fine with my S7 Edge laying here beside me, never had problems. I have three different networks around me I can try out.

Anyone had the same problem? I can find som info about this exact issue for the S7 Edge for some, but no solution from that works on the S8..

N
 

tim2london

Senior Member
Mar 12, 2013
412
111
this is an old problem S7 had
you need to toogle in settings > connectivity > wifi > advance > smart network swithc OFF

i think this was - but dont remember well since it was a while ago - but basically you need to turn off the option of phone switching between phone and wifi data
 
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gsxrjjordan

Member
Dec 25, 2012
5
1
Having the exact same problem with my Ubiquity wifi network (ie, not some janky cable company router) with my just-booted up S8. Smart switch was off by default, and after switching it 'on' and back 'off', no change.

This was the first thread I found on the topic, will update with any solutions.
 

EvoTillIdIE

Senior Member
Apr 1, 2011
174
50
Having the exact same problem with my Ubiquity wifi network (ie, not some janky cable company router) with my just-booted up S8. Smart switch was off by default, and after switching it 'on' and back 'off', no change.

This was the first thread I found on the topic, will update with any solutions.
Make sure hotspot2.0 is off

Sent from my SM-G950U using XDA Labs
 

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choccy31

Senior Member
Oct 16, 2009
716
25
Hi,

just had the phone for an hour and almost right away after first setup the wifi radio disconnects/turns off and re-connects/turns on automatically every 20 seconds or so. No matter wich network I try.

Working fine with my S7 Edge laying here beside me, never had problems. I have three different networks around me I can try out.

Anyone had the same problem? I can find som info about this exact issue for the S7 Edge for some, but no solution from that works on the S8..

N

Probably means you have virgin broadband like me ?
 

PiCkLeS

Senior Member
Mar 30, 2006
408
170
Kristianstad
Samsung Galaxy Z Fold2
have u tried going to a free wifi spot (starbucks, mcdonalds) see if the issue persists - maybe is your router refusing connection

As I wrote I have three different wifi to test with but yes makes no difference. This is a well known but not solved problem with Samsung phones.. three different makes of manufacturers, different settings with a/b/g/n and all show the same problems.

I also installed the small new update today for the firmware. Still same problem.

I'm guessing I'm about to get a replacement phone. I'll try that on Monday.
 
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gsxrjjordan

Member
Dec 25, 2012
5
1
I'm not seeing the same problems with public wifi as I am with my Ubiquity Unify AC AP Pro access points at home - definitely weird.
When it is connected, I'm getting my usual 100mbps speeds, but it continues to drop regularly (not the every 10secs it did when I first powered it on, but every minute or so).

One thing that was mentioned was changing channel bandwidth from '40' to '20'... I don't see anywhere to do that on the S8?
 

gazzacbr

Senior Member
Dec 3, 2007
1,175
244
Dubai
I'm not seeing the same problems with public wifi as I am with my Ubiquity Unify AC AP Pro access points at home - definitely weird.
When it is connected, I'm getting my usual 100mbps speeds, but it continues to drop regularly (not the every 10secs it did when I first powered it on, but every minute or so).

One thing that was mentioned was changing channel bandwidth from '40' to '20'... I don't see anywhere to do that on the S8?
Doesn't that mean on your router?
By changing the broadcast bandwidth from 40 to 20 you will increase the signal produced (same power is covering less channels)

Sent from my HTC One_M8 dual sim using XDA-Developers Legacy app
 

jim302

New member
Apr 21, 2017
1
1
I had this happen on a UniFi UAP-AC-Pro network with my S8 as well. I turned off Nearby Device Scanning on the S8 under Settings-> Connections -> More Connection Settings and that seemed to fix it. Strangely, I did not have the issue on my home network which has a single UAP-AC-LR access point with an otherwise similar configuration. Not sure if this setting change was really a fix, or if I just temporarily got lucky.

If turning off Nearby Device Scanning doesn't work for anyone, it might be worth playing with other settings within your network such as Band Steering. Some of these require turning on advanced features within the UniFi controller. Also I would be curious to hear whether those who have issues are on networks with a single access point, or larger installs with multiple access points.
 
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izeen

New member
Jun 27, 2009
1
0
Very recently got the Samsung S8 and I'm having some wierd WiFi issues. When connecting to the network everything is fine i get almost maximum download/upload speeds(500/500) from my UniFi AP-AC-PRO. But after being connected for awhile 30-60mins the speed drops to around 30mbit downstream and upload around 200mbit. If i disconnect from the Wi-Fi and instantly reconnect i get full speed again. I've tried switching settings in the ap, went from everything on auto settings to static channel/transmit power and been trying vht40/80 but makes no difference. If i have smart network switching on i get disconnected and put on LTE instead. All my other devices have blazing WiFi speeds as usual. I'm gonna try turning of nearby device scanning and see if that helps.

I started a thread in the ubiquiti UniFi forum as well but i cant link that here(not enough posts on this xda account)
 

duckysempai

Senior Member
May 30, 2007
90
22
Very recently got the Samsung S8 and I'm having some wierd WiFi issues. When connecting to the network everything is fine i get almost maximum download/upload speeds(500/500) from my UniFi AP-AC-PRO. But after being connected for awhile 30-60mins the speed drops to around 30mbit downstream and upload around 200mbit. If i disconnect from the Wi-Fi and instantly reconnect i get full speed again. I've tried switching settings in the ap, went from everything on auto settings to static channel/transmit power and been trying vht40/80 but makes no difference. If i have smart network switching on i get disconnected and put on LTE instead. All my other devices have blazing WiFi speeds as usual. I'm gonna try turning of nearby device scanning and see if that helps.

I started a thread in the ubiquiti UniFi forum as well but i cant link that here(not enough posts on this xda account)

I'm having the exact same problem as you. Wifi connects at full speed at first, then after a while speed drops. Has gone down to 1Mbps numerous times. Disconnecting then reconnecting fixes it for a while then it starts all over again. I'm connected to a TP-Link AC1900 running dd-wrt. May try going back to stock firmware on the router to see if that helps.
 

MintHat

New member
Apr 25, 2017
1
0
So has anyone come up with a permanent solution to this? I'm in the same boat with my ac-ap-pro and s8+. Disconnects every 20 seconds or so.
 

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  • 1
    this is an old problem S7 had
    you need to toogle in settings > connectivity > wifi > advance > smart network swithc OFF

    i think this was - but dont remember well since it was a while ago - but basically you need to turn off the option of phone switching between phone and wifi data
    1
    have u tried going to a free wifi spot (starbucks, mcdonalds) see if the issue persists - maybe is your router refusing connection

    As I wrote I have three different wifi to test with but yes makes no difference. This is a well known but not solved problem with Samsung phones.. three different makes of manufacturers, different settings with a/b/g/n and all show the same problems.

    I also installed the small new update today for the firmware. Still same problem.

    I'm guessing I'm about to get a replacement phone. I'll try that on Monday.
    1
    I had this happen on a UniFi UAP-AC-Pro network with my S8 as well. I turned off Nearby Device Scanning on the S8 under Settings-> Connections -> More Connection Settings and that seemed to fix it. Strangely, I did not have the issue on my home network which has a single UAP-AC-LR access point with an otherwise similar configuration. Not sure if this setting change was really a fix, or if I just temporarily got lucky.

    If turning off Nearby Device Scanning doesn't work for anyone, it might be worth playing with other settings within your network such as Band Steering. Some of these require turning on advanced features within the UniFi controller. Also I would be curious to hear whether those who have issues are on networks with a single access point, or larger installs with multiple access points.
    1
    Found the solution (for me at least). Although it looks like the Wifi is disconnecting it actually isn't. It's just that the S8's aggressive power management kicks in at the same time Wifi goes into 'sleep' mode and blocks the apps that would normally be receiving push notifications (Gmail, Nine mail etc). This stops them from receiving notifications and makes it look as though wifi has disconnected. I followed the steps here then RESTARTED the phone, and now all is fixed:

    https://www.forbes.com/sites/bensin...s-just-like-chinese-smartphones/#2fa8629b7a91