Unhappy [Q] Nokia Lumia 925 contrast bug

Sometimes I have this glitch (video below), this time it`s in Instagram, but sometimes it`s visible even on homescreen. I tried to change sensitivity, screen brightness. It`s really annoying. Couldn`t find anything similar, sooo... Anyone?

It was with Amber, with Black, and now with 8.1, so i`m not sure, that it`s SW issue.

Nokia Lumia 925
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