I have been experiencing a recurring theme in that after purchasing a movie for download from Amazon (usually I select HD) through the TiVo UI, TiVo locks up and becomes totally unresponsive to the remote after just a few minutes. The only way to resolve the problem has been to restart the TiVo. Today, I purchased another HD movie from Amazon, and after a couple of minutes TiVo displayed the reboot screen with all front panel lights on. Shortly thereafter, TiVo displayed a "green screen of death" instructing me that it had encountered a serious problem and was attempting to fix it, and that I dare not remove power for the next three hours! Has anybody else had this experience?? Thanks!