Good thing I caught it when I did, otherwise it would have continued that way another 3-4 days until the HDHR Prime did another background channel scan.
The sympton was all my cable channel recordings were missing from the schedule.
Looking in the log I saw that this mornings guide update didn't get EPG for my cable channels.
In fact it had deleted the scheduled recordings, log was full of lines like this
[DVR] Deleting job with expired serial: 1688608800-21 Viewfinder (EP011788090192)
I was going to do a delete and recreate guide database and that's when I saw the image above.