I haven't had any side button trigger failures yet, but I also try to program so that it's rarely used.

I  read that there is a bug or something with using PNG images for backgrounds. I have been using PNG's for backgrounds and maybe this is the cause of the wierd issue i've been having.

I just updated one today with jpeg and bmp backgrounds and added a UPS to the system. While I was there everything was working flawlessly. It was actually working flawlessly when I got there, but I updated just to be safe.