For the past week or so, after not having this issue sincenit was new in March, my Fairphone 3 will sometimes lock itself, suddenly appearing at the locked but screen on mode. It seems to mostly happen whilst playing games, but also on Chrome and the Google popup browser thing
Tried a factory reset, and reinstall all settings/apps from cloud backup, and did happen once more since when I tested Pokémon Go and a webpage.
Has this happened to anyone else as I can’t find reports? It’s a bit random, not very reproducible except running games busily makes it more likely.
EDIT: last couple times I noticed the top left notifications jump about, one time it seemed to go from Giffgaff to O2, yet I thought it also happened on airplane mode once!?
Thoughts… RAM/CPU overuse issue? Screen loose? Problem with lock/power button? Security setting bug? Can’t decide if seems hardware or software related so what to try!