I have an R15-300. I've always had problems with the usual things like series links recording repeats when I have them set to first run only, or not recording at all, as well as occasional resets. But, not until my machine auto-upgraded to 105F did I experience the horrible crap people talk about here all the time. My machine would just reset by itself for no reason, or lockup, or record black screens, etc etc. Anyway, after reading a lot here I realized my only option was a "Reset Everything" (sometimes referred to as a reformat). So, I taped some important programs I had saved onto a VHS tape (man I need a dvd recorder) and took the plunge. I could not be happier. First off, the UI is like 5 times faster! Everything responds so much better now Not to say that may degrade as I add more stuff to the box like series links and some recordings, but I don't ever remember it being this fast, even when it was new. Maybe this post is a little premature, cause I did just do the reformat this morning, but I wanted to share. Thanks for all those that post here, you've been a great help.