Just started service three weeks ago with an HR24 This past week the DVR has started to have playback problems Sunday it would not play back a show that was being recorded until i rebooted the box after the recording was done prior to reboot i was only seeing a black screen. Monday night a recently recorded show had the same problem but this time the recording was no where to be found after the playback. Today we wetre about 3/4 of the way thru playback and were unable to fast forward playback would pause when attempting to FF Mon and Today were first attempted to be accesed via MRV. Any advice? Is the DVR dud and in need of being replaced? Thanks