wrote: I agree with
that pixelation is almost never a box problem but usually a signal problem.
Just to rule out all possibilities, swap the problem box out with one of the other boxes that works fine to see how they both operate. If the problem box still has the pixelation issue it might be the box but if the moved working box starts showing signs of pixelation or other symptoms it's definitely a signal issue.
Do you have Spectrum internet and do you have access to the modem's signal page? If so, post the signals page and event log...they may show something obvious.
I agree with Red's suggestions! If the issue comes down to the box, the rare 6-tuners are the first choice. An Aris 3600-M and Cisco 9865. (Six tuners on each,) Or the 4-tuner World Box. No clock on the World Boxes, no Caller ID on TV for landline Spectrum Phone Subs on World Box.
Satch