I've noticed this problem in the last month or so, where when I try to use my Xoom after it hasn't been used for a while, it just remains completely unresponsive. The white LED will continue to flash, telling me I have a new E-mail or something, but I just can't wake it up with the power button. I'm forced to do the reset by holding down the volume and power buttons together. This problems is happening several times a week, and is really becoming a pain when I expect to just be able to take out the tablet and login to it. It's a stock 3G version that has been encrypted and is using a password. I don't remember this happening before the 3.1 update. I have seen other manufacturers tablets having similar issues lately. Any ideas?
If it has ever worked properly then you might suspect acorruptApp download.
You could approximate a binary search by uninstallimg hAlf of the apps you have installed.
If the problem disappears, then reinstall half of the apps you just remained to see if the problem reoccurs.
I was kind of hoping to be able to get the 4G update before I try something drastic like removing lots of apps or doing a factory reset. I'd hate to reinstall everything twice.