I realized that when I have this problem, on the iPhone the sound comes in mono. It only comes out of the handset. It doesn't come from the speaker, it's like I'm making a phone call.
reboot does not work but I will try the method mentioned by @Robustez. making a phone call while listening to music may be the solution.
ozguravcil
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by the way, when you make a phone call while listening to music, sometimes the music starts playing behind the phone call. has anyone experienced this problem? (ios 17 had the same problem)