This morning my 5900 PVR was frozen. I had to unplug the receiver to get it to function properly. This afternoon I noticed that it was not recording a show for my wife and when I checked the guide it says it was to be recorded but it didn't. Then when I checked out some of the recordings on the drive I couldn't play any. Then I noticed that although the list showed recordings and the amount of time for each show the hard drive was empty. This is the second time in a month that this unit has done this. I had to erase all of the listings and unplug the unit and it is now working properly. Could this be a hard drive failure?