Phone speaker not working if Bluetooth switched on.

[leela3000]

I'm suddenly having problems hearing calls or any audio. On a phone call I can only hear the caller if I putput them on speaker, and for general audio (videos etc) it doesn't work at all. 

I can't get round this by just switching Bluetooth off, as I have a Samsung watch that is synced. How do I solve this? I've had the watch for over a year, and nothing has changed to cause this. 

[TactfulGlove]

Also try
-Settings
-- sounds and vibration
---separate app sounds
Toggle that in the opposite direction and see if that works

[leela3000]

All your suggestions checked, and all as they should be. Everything works perfectly as long as Bluetooth is switched off. As soon as I switch it on, I lose audio.

[TactfulGlove]

Sorry i may have run out of ideas. Have you gone through all the diagnostic tests on the samsung phone. If any errors report back. You might need to contact samsung directly for support. At least we tried. If you ever work out what is wrong please post back. Knowledge is key!