Over the last several weeks, our FIOS HD DVR/Receiver seems to drop both audio and video several times per hour. The TV screen simply goes to black for about 3-5 seconds, then the program resumes. We're also seeing problems when programs are recorded: on playback, the video will suddenly freeze, then begin playing for about 2-3 seconds, then freeze again. This cycle continues until we simply quit and delete the recorded program. We've tried everything, including shutting down the receiver and unplugging it for a few minutes. Anyone having similar problems -- and how can we resolve this?