when I start a Phone call, after a while, the other person stops hearing me. I tried a reboot and a system Update, still the same shit.
I used to use my old Phone for navigation with Google Maps. This is not working with f4. Navigation starts but then the speaker, who tells the directions, stops. When I stop, and look at the phone, the position is mostly correct, sometimes it needs some time for actualisation. This is useless in a car or a bike.
since you mention in both your topics an issue including a time span:
Is it maybe the same time span affecting both issues like phone call stops after x minutes and the navigation-speaker also stops after the same amount of time ?
In case it is like that then this sounds to me a bit like either an issue about the defined screen lock (-> on my FP3 it´s within settings → security - I guess it´s more or less same on your FP4 - depending on which android version you´re using) and/or the defined time span for turning off the screen automatically (settings → display → extended settings).
I experienced kinda similar behaviour on my FP3-device and it needled me for weeks until I found out it was a specific setting I made - stupid me
And in case GMaps still stops working, I would try another Navigation App, to see if its a general Problem with speaker or more the app. I as well use Magic Earth instead of GApps, as it also has traffic information etc.
For Navigation, do you have Wifi and Bluetooth scanning on? Also is Google Location Accuracy turned on? Those settings might provide more reliable/faster location information while travelling around.
And btw. is your system up to date or maybe an update available?
When also other Apps stop Wirkung after some time you can call * # * # 2886 # * # * to test the speaker etc.
If you want to try to resolve the issue or send back is a decision only you can make.
The only other thing I can think of is VoLTE and/or 5G. This is currently causing several issues when turned on, so I would turn off one or the other or finally both to see if this helps. And in case it helps I would contact Support to inform them about the provider/network and the noted issues.