Power button would be a usual suspect for most FP1 veterans (like me) here, yes. I don’t know how much you’ve read about the power button issue, but it’s important that the core of the problem (if this is the cause!) is the (white) power button on the motherboard, not the outer black cap that Fairphone still offers as a spare part. Frankly, if my own FP1U’s power button was damaged, I would probably look for a fully working motherboard right away; however, it is possible (for repair shops) to solder a new power button on the motherboard as well. If you want to do so, here’s the report of a fellow FP1 owner who was able to replace his power button by a compatible power button designed for a different smartphone.
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