When turning off my FP3 for the night, about 1 out of 4 times, it does not properly turn off. I only notice it the next morning when restarting my FP3. I have to press the of/off-button for about 10 seconds before my phone starts to boot (in stead of the usual 3 seconds), and substantial battery drainage has occured.
I have exactly the same issue with my fairphone 3. I must power on in bootloader mode, or with the power cable or remove and reinsert the battery to restart my phone.
And as you say, not every time.
I also noticed the battery drainage, once restarted.
