|I am having the same issues with mine.|
Glad that I did not purchase the geek squad contract..seems like it is not expediting anything.
Anyways my DX4300 is doing the same thing. It goes into a zombie state every 30 minutes. The present work-around is to pull the power cable and reboot.
My system is back at Gateway, for the 2nd time. hopefully they can fix this lemon of a computer.
I have already written the system off, and use a Microsoft Home server for my data, and a laptop as my primary.
waste of $800 if you ask me, might as well have gone to Vegas and gambled..at least I might come home with some winnings.