Comcast Cable TV Pixelation Issues - Support Unavailable

Over the past week some channels we watch can no longer be viewed because of excessive pixelation.  Example 836 Lifetime and 859 AMC.

Box was reset.  All inside connections double checked and snug.  I am unable to get support to talk on the phone or to online chat, wait times are too long.

We had this problem a few winters ago, they needed to tighten a connection outside but I can not get anyone to help.