Lines on my camera screen.

I solved that problem by reseting my camera settings. I hope your phone is still in warranty if that does not help.

BTW you could also do soft or hard reset if nothing helps.
 
Thank you Karthik, hoping it will happen to my phone too. I'm bit worried :sweaty:

try not using the camera for a few days and do a full battery cycle
this is what i had tried for mine
the issue was more prevalent when my battery was low and sometimes the camera wouldnt open at all