Thank you for reaching out! I am sorry for the delay in response. The forums aren't monitored as closely as our other support channels. I haven't heard of any reports of CNN pixelating or getting audio drops. I would recommend trying the troubleshooting steps here. If you notice issues continue to persist, your best bet is to touch base with technical support to help fix the issue.
Tony | Community Mod.
I'm having the exact same problem with CNN. Audio dropouts and pixelation. Only on CNN. And on both of my TV/PVR's. Have had this problem on and off for a year or so. Getting very frustrating !!