This can happen when TV Receiver and the DVR get out of sync in their communication to record and play your "live TV" program and have to give up OR when the DVR has to use all its output channels for something else. Since the UI is designed around a perfect world where communication is never interupted, the message describes the expected issue not the actual one.
The way around this is to restore the reliability of the communication between the Wireless set up box and the DVR: Move the WAP away from and out of line with other RF sources, try to get the WAP closer to, or a better line of sight to, the Wireless TV Receivers, etc. We also recommend restoring your Dvr ( this wont cause any recordings to delete).
Dee, AT&T Community Specialist
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