Microphone cut off in Jitsi call after screen lock

### Steps to reproduce

1. Join Jitsi conference
2. Lock screen

### What happened?

### What did you expect?
I expect to hear and be heard.

### What happened?
After a few minutes of normal functionality, I can still hear the participants, but they suddently can no longer hear me, until I unlock the screen again

### Your phone model

Poco F3 (Also tested on Pixel 5)

### Operating system version

Android 11

### Application version and app store

Element v1.2.1, olm v3.2.4, GPlay

### Homeserver

matrix.hin.ch

### Have you submitted a rageshake?

No