I have 2 HD tivos and 1 Direct Tivo and have never had a reboot that I know of. I have checked the temp on the diagnostic menu and the average is 127F it has not moved. I also put a laptop cooler under it for a day, pretty noisy but it still rebooted at the wrong time. I also have not noticed the fan coming on louder except during a reboot. It has been getting worse as time goes on. I had had it for about 3 weeks. One program 3 days ago had a stuttering problem for about 1/2 hour. It would skip foreword every other frame for about 10 frames then run normal then skip then normal, no sound when I tried to FF it the meter just went forward and back about 5 min over and over for as long as I held the button the picture went also forward and back very strange, after about 5 min of holding the ff button it straightened out.