I have a Motorola QIP72161 DVR, a Western Digital Mybook 1TB external drive and Fios release 1.9 (build number 10.95). During playback of recorded shows we sometimes get a "jumpy" or "jittery" image on screen (more like scrambled pixels) and a skip in the audio feed. It gets pretty annoying at times and a reset of the DVR does not seem to help. Is this a common issue? Should I look to the wire connections or is this a known issue with external drives and video playback?