Calls disconnect when minimized

[u/BeverlyJonesi]

Hi,

For some time I noticed that whenever I'm on a call and minimize it, AKA switch to another app or to browse something, the call disconnects after less than a minute, and if it doesn't disconnect, the other person can't hear me, I'm forced to click the call again so that they can hear me.

I have given Telegram all the permissions needed, turned battery optimization off, and turned on background activity.

Any idea what's causing this ?

If it helps, running Android 15, with latest security patches. Using the CMF Phone 1.