I don't claim to be an expert, but my RC3200 will occasionally stop responding to either the touchscreen or the hard buttons. I can usually get it to wake up by pressing the other: i.e., press the touchscreen if it's not responding to the hard buttons or vice versa.

Occasionally, it locks up hard enough that this technique won't work, and I have to resort to pulling the batteries. If the remote gets into this state, it usually tips me off by keeping the backlight on indefinitely (I have it set to a 3-second turnoff).

Hope that helps.

Mike