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Phone stopped recognizing unlock PIN - keeps blocking me out

MWX

Lurker
I have the device for over a year and always used the same unlock PIN.
Yesterday I used it as usual, but then suddenly it stopped recognizing the PIN. Kept saying it's wrong. First locked for 30 sec, then a few minutes, and now it keeps blocking for 2 hours.

I didn't change anything, didn't instal any new apps yesterday, nothing. I do enter the normal PIN again and again (which of course I remember to be correct) – how can this happen?

I tried rebooting the phone many times.

Please help me. I'd like to avoid a hard reset as much as possible.
 
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