Randomly 'optimising apps'

I have a problem where my Fairphone 2 randomly turns off, and starts the process of ‘optimising apps’ (about 140 of them), which takes roughly 20 minutes and drains the battery. This is happening more and more often, to the point where it now occurs daily.

What to do? Help is very much appreciated.

Check out the tips right at the beginning of this thread:

I’d recommend to especially check if your battery sits tight or loses contact. If necessary, fill some folded paper at the lower end of the battery.

That “opimizing apps” screen appears when the OS crashes (or you shut off/restart the phone) while booting.

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