I have a R15-500 that was purchased in Dec. of 2005. Up to now, this unit has been virtually trouble free and although the following occurrence is not that bad it is a curiosity!!!! Twice this week, at around the same time of day, the unit shut down and restarted. There was no power interruption as nothing else in the house indicated such. The TV screen went black for a moment, then I got the welcome screen and then the accessing the satellites and then all was back to normal and it rejoined the program in progress. All this in less than 5 minutes. The guide has to re acquire info but the Play list was still in order and the to do list was up to date till the 20th. Anyone care to hazard a guess as to what is going on.