NBCSN, CBSSN, ESPN NEWS, and many others channels have not worked on my cable for over a week. customer service was no help. restarted cable box multiple times, no effect. it is not the channel broadcast, as they appear on the app. i won't pay for channels i can't receive.
May be too many splitters and open ports in line. post your modems signal level and error log pages. Then hold in the select on the remote for 10 seconds, hit the up arror, what are the IB and OOB frequencies and levels for channels that don't come in?