Problem with mic cutting off

[DanielHoare]

Recently I have started noticing some problems with the microphone on my S10. The main problem is that the mic will randomly just turn off completely, I will try to record videos on every application that allows video and audio recording (instagram, snapchat, camera, tiktok) and there's no sound whatsoever. 

Though I have 2 things that may be of assistance in discovering the problem: 1. the mics work when doing a loopback test on the *#0*# settings thing. 2. The mic works for an unknown period of time after restarting my device but then turns off again later (my estimate would be around 2-3 hours later)

I think I have done everything I can with bixby voice (force stop, clear cache) and I have done everything when it comes to app permissions. Is there anything left for me to do?

[BandOfBrothers]

Try Safe Mode @DanielHoare 

Put the phone in Safe Mode which disables your downloaded app's but let's your stock app's keep working. If the issues stop then this highlights a downloaded app as the possible issue. Come out of Safe Mode and start deleting your most recent downloaded app's one at a time until it stops. https://www.samsung.com/uk/support/mobile-devices/how-to-start-my-galaxy-device-in-safe-mode/ 

If this does not help then I'd suggest to speak with a Samsung Experience Store or Samsung Service Centre and let them have hands on with the phone. 

I wish you all the best with this.