Guide stops Tuesday 5pm. "To Be Announced" appears

in every time slot.  This happened earlier this month on a Monday at 5pm. Unplugging the DVR solved the problem.  Is there a normal time frame when Cox updates the Guide each week?  If i don't unplug the DVR, will the Guide fix itself?   I'm in Phoenix. Cisco 9865 Record 6 box.

Cox has told us (in this forum) that they don't control the Guide. It is provided for them. But the DVR won't record unless the guide is working. Has Cox identified the source of the problem with the Guide supplier?