Greetings. Our SD-DVR40, received from DTV March 2005 in exchange for a failed GXCEBOT, started spontaneously rebooting a lot starting Tuesday night -- at least 4 times in about 30 hours. There is no picture freeze or pixelation, just Blam, a very brief blank screen and then "Welcome. Powering up". Absolutely no probs with this unit post-disk-addition until this. Since there is no freezing or pixelation, am I correct to move hard drive way down on the list of likely causes? Other than power cleanliness issues, any other suggestions where to go with this? Directly to Best Buy for an R10? Many thanks, folks.