I have only had one instance of the system freezing today. Locked the system and went to lunch, when I got back the laptop had no display or HDD activity and the external (secondary) 17 monitor was stuck on a purple background and I had to perform a hard reboot. It seems close but maybe I'm missing some power management settings in the device mangler? I've set any configurable usb settings to not turn off the device. I'll update with what I find...
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