Vizio 65" pixelating after Xfinity XB8-T upgrade...

Received a new XB8-T upgrade from Xfinity... Pixilation has begun on most channels, some worse than others... Tightened, restarted, rebooted and moved the device around, no difference... It will go away once I unplug the new device... Multiple devices online, 6 Wi-Fi outdoor security cameras and no pixilation with the old Arris Gateway.... Ideas?