Did you try to reset your cable box from the Cox website?
SIgn into Cox > My account > TV > (Equipment: Cox TV Box) Reset device
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Have any scheduled programs recorded since you first noticed the problem? Schedule something to record in the next few minuites and see what happens.
Do you know there wasn't an outage when scheduled programming failed? I'm not sure how you verify that, but if failed recordings was an isolated incident, it could have been due to an outage.
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Did you get an error when you accessed the "Modify Series Priority" screen?
DVR Guide > Series Manager > Right arrow > B button
If you could get to the "Modify Series Priority" screen, you don't have corrupted programs. The "Edit Record Options" test wouldn't have been necessary.
Since you're able to set manual recordings, your DVR service status is probably okay, but you could contact cox.help@cox.com and ask them to check on it. Include your name, full service address and a link to this Forum thread.