EPIX and Showtime Channels are tiling.

"System Refresh" failed.

Also, no splitters are involved except the one Comcast installed.

Comes across fine on internet, doing a "Refresh System" on the TV.

Thank you, but the connections are tight.

Recordings on those channels are also tiling, which leads me to believe it's not a hardware issue.

Audio is getting garbled on those two now as well.

Other channels, e.g.s, HBO, Fox News, EWTN, Starz channels are fine.

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@20someYears wrote: "System Refresh" failed.

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Then, as stated, you'd need to have a Comcast premise tech take care of it. Call them at the phone number on your bill or 1-800-Comcast, or use one of the options on https://www.xfinity.com/support/contact-us/. Insist they send a tech out to identify the cause and correct it.

If the tech finds bad coax, splitters, amplifiers, or connections in your home (even if Comcast originally supplied them) you'll probably have to pay for the visit unless you have their Service Protection Plan (https://www.xfinity.com/support/articles/service-protection-plan, closed to customers that don't already have it). If the trouble is due to a faulty Comcast rental device, or anything outside your home, you shouldn't be charged.

Thanks.  I live near a store and they switch boxes at the counter without question.  That usually works.