Display Crash

Hi All, I am having this problem with my new 34" Acer ED347CKRbmidprzx ultrawide monitor. I have this monitor connected through Display port but I also have my TV connected to the GPU so I am using the extended desktop. Sometimes when I turn off the TV and turn the monitor back on, the monitor...

Sinec yesterday, when watching videos or gifs I get the videos with black blocks of pixelation all over it, however when I go back to the start and replay it there are no problems. When I play videogames it runs fine, no perceivable problems.

i currently have a evga 750ti ftw and was wondering how much more fps i could get on newer games if i was to get a evga 760 SC