A3 phone screen flickering: How do I fix it?

[AC Question]

6momth old A3 phone and I noticed a few days ago that the screen fkickers at the top when on low brightness (which is most of the time) this was manageable however its not began to flicker and flash all over unless I put the brightness level practically on full.
The phone hasnt been dropped and shouldnt have got wet.

 

[Laura Knotek]

Are you using adaptive brightness in your screen settings?