My TiVo HD (with a WD expander drive attached) has been acting very strange for the past few weeks. Get these odd symptoms: The unit very often does not record the entire show. I have "partials" all the time. Oddly enough, sometimes when I get a partial on one program, another one that was recording at the same time is fully recorded! TiVo often acts very slow when using the TiVo Central. Sometimes it takes several minutes for anything to show up. The TiVo sometimes reboots for no reason. Sometimes when it reboots, the black color on the start up screen is purple. : (When watching shows, quite often the picture gets jumpy and skips ahead. Think this is something that can be fixed? I could put in a new drive, but if it's the main unit, I would be wasting my money. Think the expander drive could be causing some of this? (I hate to disconnect it because I will lose everything I have recorded.) Any help or thoughts would be greatly appreciated!