Heavy pixelation on main tv box but XRE errors on both boxes

Problem first started maybe 5 weeks ago where some channels experienced heavy intermittent pixelation that also appeared in DVR recordings on the main cable tv box. It was annoying but I didn't have time to contact support. However, now I have our main tv box having intermittent issues of the following: pixelation, the XRE-03062 error and inability to load Xfinity apps. The other tv box can load Xfinity apps, but can't load any live tv because the XRE-03062 error message returns instantly and repeatedly after "Try Again" is selected.

I've already tried numerous attempts to fix using the Xfinity assistant and no attempt has made any positive change. I've also rebooted the main tv box and the secondary boxes. My Xfinity internet service is unaffected and there are no outages reported in the Xfinity app in my area. 

Can someone assist with troubleshooting this issue?