Ugh . . . I'm ready to give up on this. I had to reset everything again over the weekend, and then today two shows didn't record because the channels wouldn't authorize. I'm to the point where there is no benefit to scheduling any shows to record without first trying to log into the channel right before . . . which obviously defeats the purpose.
I recognize this is an Xfinity issue and not a Channels issue, but if the only thing I can record is from my antenna, I can use my Plex pass for that.