I have the following issue with my phone (which is really great otherwise!) :
In some cases when the phone is locked, screen off, the phone refuses to unlock when using the fingerprint scanner or the power button.
when that is the case, the screen lit up, but stay black.
at that point I can do nothing to unlock it, but wait for around 20 sec.
It's really annoying.
Thank you for looking into this issue
here is the phone build number: