I have also been battling this issue since I upgraded my FP4 to Android 15. The fact that this has been an acknowledged problem for over two months makes me this that this is not a high priority for Fairphone to fix despite the fact that this turns my smart phone into a dumb phone that’s only good for phone calls and text messages. I’m days away from giving up and just buying a phone from a different manufacturer and warning everyone I know against buying Fairphones. Absolutely shocking lack of QA testing and development follow up.