Two thoughts:
- If there is enough time in between the reboots, use it to backup all data that is important to you.
- The power button is indeed a possible explanation (although not often on the FP3). Ideally, you would test your motherboard in some other FP3 owner’s phone to check if the reboots stop occuring. Also have a look if there might be a Fairphone Angel nearby 👼 The Fairphone Angels Program and Map (Local support by community members) If the power button is confirmed as the culprit, the easiest remedy would be replacing the Rear Module which is not available in the shop, but can be found in this forum’s marketplace every now and then.