Hello,
Pixilation is almost never a box problem. A reboot will only be a temporary fix if at all. Pixilation is often caused by maintenance on the line or a problem with the line or signal. Inside and/or outside wiring is most likey the problem, or something with the cable line.
If the issue persists, you will need to call Spectrum for a signal and drop line test. In preparation for your appointment, avoid rebooting any equipment, (boxes, modems, routers) for six hours prior to your service call. Equipment reboots will reset the signal reading error codes to zero and the tech needs to read those codes.
When the tech comes, tune to the channel(s) the pixilate the most for the signal reading. This is a wiring issue inside or outside the house that needs to be corrected if the problem persists. with the signal and drop line test on a service call work order.
Satch