I don't have the problem with the iPronto crashing while it is in sleep mode. But for sometime I have had the problem with the screen buttons and hard buttons working and sending out IR codes even when the device is asleep. This is really annoying when I'm on my tv channel page and I tap the screen to wake it up and it changes channels on the Tivo which I then loose the buffer for the channel I've been watching.

Seems there is a bug in the firmware that is not shutting down the IR sending capabilities while the device is in sleep mode.