I've taken the battery out a number of times and it's not changed anything, I might try a full disassembly at some point anyway just for the fun of it though
I have experienced that the microphone is in a weird spot on the left border of the phone, frequently where my fingers are placed when calling. So maybe check if you're covering it too!
It may well be, it's possible I got a drop of water in it after washing my hands or something which might've done it but I'd be pretty disappointed if that's enough to break it
Seriously, I'd also recommend to unscrew the screen and screw it back together. For me it made wonders. And if this also doesn't bring you anything, you should text support - in the end you have a warranty for a reason, right
for this reason I waited for the Fairphone 5 which is responsive, has an oled display and the components Work without issue. have had it for a year and am looking forward to still using it in 6 years from now
The few advantages you mean, wouldn't mind the FP if they'd use a processor that wasn't years old and at least performed better than the Tensor G2 (A processor highly regarded as absolute crap)
The fp4 has an ok cpu with a Snapdragon 750, and fp5 is pretty good, has a QCM6490.
Not the best value for money though considering the price of similar spec phones 😅 (except that will be worth it if you end up needing to replace the screen)