Default Green screen while scrolling

Guys..
I rooted my s5.
Removed bloatware.
Nova launcher

I started having this weird green flashes whenever I interact with the app drawer.. Or whenever I press menu.
A frnd told me this green screen thing is actually a screen pblm as he has seen such in Nexus too.

I'm really worried if that's a hardware pblm.

I don't mind resetting the fone but I don't want to root agn.
Is there any way where I can restore fact setting but not lose root..???

Galaxy S5 LTE
Galaxy Note 10.1
JELLYBEAN
GT N8000
Cmw recovery!

X10i
2.3.3
WOLFBREAK 6.0.0
BB=71
STOCK KERNEL