I believe the problem to be distinct from this, but the manifestation is similar. Even with Bluetooth on permanently opening some apps causes a sudden restart of the entire device. I am on Fairphone 5 with iodeOS 7.2 and I am looking for suggestions on how to debug this problem or properly report it.
See this post which may offer some clues:
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Sorry, I am repositing this here as I confused the threads.
Thanks for pointing me there. Maybe this problem actually is related. It happens when I interact with apps rather than switching BT on/off, but it’s entirely possible that the apps or system are checking for BT connectivity.