Been doing the same for me the last few days. I even returned my DVR box and now its even worse. I have done all the typical, reset/refresh via in menu, online or just unplugging the thing. Tech support has been horrible, between an annoying an AI and human that out right lied, said there was an outage in my area when their wasn't. Even the cox website said there wasn't one.
Before I took my DVR box back, it simply wouldn't let me watch recorded programs. Instead when I went hit play it tell me "you have finished watching this already" and would just right out delete it. I took the box back
Then on this new one, it tell me I don't have subscription to channels that I actually do. Then after restarts it will only allow me to record 2 shows instead of 6 that I am paying for it. Then that's if those two actually recorded in the first place. Have missed many shows for days now.