Screen doesn't switch off

[office_SZ11]

Model: ZE551ML
RAM: 4G
Firmware/APP Version: 6.0.1
Frequency of Occurrence: always
Rooted: No
APP Name:

Zenfone 2 de luxe. 4/64 GB. Android 6.0.1. The screen does not switch off after 15/30/60...seconds regardless of settings. It also doesn't switch off after I pick up a connection--it blinks erratically. Can somebody help me please?

[ARP_ASUS]

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