Xfinity digital starter package with a Tivo Premiere XL4 with a Motorola MS CC installed.
Recently, whenever I use the internet (via WiFi or wired Ethernet) it causes my HD rebroadcast channels (local) to pixelate, dropout, and sound stutter. This doesn't happen to other stations (CNN, MTV, USA, etc) and doesn't happen with the SD local channels. This happens with my phone or tablet (WiFi) and with my desktop (wired Ethernet).
The cable modem and Tivo are about 3 feet apart, as they always have been. I don't think it's a shielding issue because this just started within the past month.
I've checked all my connections, other than that, I'm stumped. Any suggestions? Thanks