Hi,
I cannot confirm this behaviour, for my DUO is randomly shutting down even when not in motion nor am I touching the device. I'm aware of this because my headset tells me it has been disconnected. Honestly I think this might be due to a physical constraint (especially when carrying the device around it shuts down) but I also believe this might be software based. Maybe bluetooth or some other exotic software that tries to alert me in some way (like SMS or a phone call)...
I really cannot understand why microsoft tries to sell a so called premium device which is almost unuseable. Sad but true - this device is not trustworthy at all.
Don't get me wrong, I really love the idea of 2 screens and I like the way the device works - if it works.
I think I fetch myself a multisim and put my galaxy 9s back to work at least to stay online.
I don't want to exchange this device anymore for this causes me a lot of trouble and I am pretty sure the issue won't be resolved.