Anyone else leave their HD100 powered on most of the time? It seems if I leave it powered on for several days and then try and use any of the guides with the picture in the window, the scaled-down picture gets distorted with digital artifacts. Sometimes it gets so messed up that the HD100 effectively shuts itself off and "reboots." If it doesn't "reboot" itself, turning the unit off and then on again seems to fix the problem. I am wondering if it is just my unit or an inherent problem to all HD100s.