Blue pixelated areas when playing videos

Aug 27, 2018
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I have a Radeon HD 6670
Yesterday I tried some overclocking using AMD Catalyst Control Center
2 times it crashed so I stopped the overclocking
I don't know if it is related to that but when I play videos(during spesific frames) or display some photos (probably I will see it in games too), blue pixelated areas appear on the monitor like the image below

http://prntscr.com/kn9t52

I also updated the GPU drivers