So basically today I've been experiencing some problems with my GPU/Monitor.
First I'm seeing some flickering thick blue horizontal lines, I think they appear when there are "grey" colors on the screen and appear more frequently when playing; I normally use a TV connected to a HDMI interface, 4K res.
I used my computer with another monitor and the problem is gone.
So, do you think is the TV? or my GPU? also, when recording with ShadowPlay it doesn't record the lines.