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You mean like it turns back on? Maybe a notification of some kind. Other than that, no idea.
Yes, it just reboots itself when sleeping or doesn't come back on from sleeping so I have to reboot it. I'm not sure and saw someone with the same issue over on XDA:
[Q] Is your Xoom plagued by random reboots? - xda-developers
I just did a factory reset and will see if it keeps doing it or not.

This is almost the same exact problem i had with my first xoom, I brought it back to verizon so they could look at it and they said it was DOA and they gave me a new one that works great.