Phone getting locked when tapping display (randomly)

Sep 6, 2016

I have very strange problem with my Redmi Note 4 MTK.
Sometimes I cann't use my device. When I'm touching screen phone is getting locked (black screen) and asking me again for password/fingerprint (like after double click on PWR button).
I made update of MIUI, wipe data and it helps just for short time (maybe one hour). After every restart phone works fine for few minutes. When I will run TRWP, phone works fine all of the time.

What is wrong?