Lock screen flickering

[anon(5619589)]

I noticed my phone's lock screen picture flickers sometimes..if i lock the phone n unlock again, then it will be normal..no problem..before this I was using gdr3 developer preview..i thought that was the cause..but then, I juz updated my phone to Lumia black..n I'm still having the issue..what should I do??

Sent from my Nokia Lumia 920 using Tapatalk

 

[multiloop]

Hi

I am a Lumia 925 user. Even I witness this problem. This has started to happen post the Lumia Black & GDR3 update.
1 in 20 times when I double tap to unlock, lower one-fifth of the screen flickers as if the video drivers of the screen are missing.
Using the unlock button on the phone returns the phone to normal.

Also, post the update, the glance screens sometimes doesn't work - I use it in the Peek mode; at times when I flip over the phone from its lying position on a table the glance screen does not show.

Any expert help...?