It’s good that you submitteed it to Fairphone Support, however I think I need to mention that we have had a growing number of these “sudden deaths” reported in this forum recently. Some very adventurous Fairphoners have resorted to fixes I don’t want to explicitly mention right away, but you’ll quickly see what I mean in (not just) this topic:
Or here: Fairphone 3+, Dead in 3 years - #7 by HolosericaCaligo