I have the Note 10+, haven't even had it a week yet and I'm already having problems. Audio will play through earpiece and not the output (or whatever it's called) speaker. I tried restarting my phone and it didn't help.
Does this occur with the device in safe mode?
No. I noticed that it happens after I unplug my earphones. My phone eventually started playing the sound through the output speaker but it took a while.
Do you experience these symptoms when you disconnect your device from Bluetooth?