Maybe this is your scenario. I know how it feels. This was me one week ago. The good news are that you can fix itI got my phone 2 days ago and this is the first time I used my AKG headphones and the right earbud got quieter and the bass was completely gone after 10 seconds of listening to music at a low volume. I tested the earbuds in my S6 and the issue was still here. I tested the S6 headphones in my S9 and it worked. It's clearly not a software issue but a hardware one. It looks like the right earbud has a big issue and to get a replacement I need to send my phone to Samsung :/ I simply don't want to. I want a new pair of AKG headphones. This is insane!
Solution #1
What I did to get the right earbud volume back to normal (including the bass) was that I plugged the headphones in my S6 (it had the Surround Sound Mod which has a volume boost so I could play music at a higher volume than my S9) and then started playing music at max volume. I have listened to a powerful track (with a lot of bass) and then I blew air in the small hole from the affected earbud until it got back to normal. When I first heard of this fix I was like "How the hell is this going to work?! Maybe it's a stupid joke but let's try it anyway" and it worked. Maybe the bass is so powerful that the internal speakers' cones will get somehow stuck and no sound will come out. Blowing some air will fix the issue.
Solution #2(?)
Instead of blowing air you can use a strong magnet (I didn't test this). If it worked for you please let me know.
Solution #3(?)
Or try to suck the air from the big hole of the affected earbud. Again let me know if it worked.
Solution #4
Get a replacement.
Feel free to leave your thoughts here in this thread.
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