I have a issue with my screen now and then it shows colored pixels all over the screen

is started somw days ago i didnt do any software update but when i change webpages or apps on the desktop thise pixels come out it's like small squares colored and they go away after a few seconds. what can it be? maybe some issues with the video card?

I have this as well.  imac i7.  Not sure if its hardware (video card) or software related.  Does it look like this?

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    iPad Repair & Screen Replacement Services
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