Pixelating TV after getting a new box



I used to have issues with pixelating channels and then I got a new box. The tech told me that the one I had was outdated and should be replaced, so I replaced it. Fast forward to a few days ago where I accidentally shorted out the non-pixelating cable box. I had a tech come in to see what was wrong, he confirmed I fried the cable box and replaced it with the newest model. Well, I'm back to pixelating channels again. Is it that only every other box works properly in my house? Seriously, why is this box pixelating after a tech was just here 6 days ago????

"Pixelating TV after getting a new box," is about XFinity-Comcast Television.

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