I too am concerned about the possibility of it being a duff motherboard, as it is such a complex item that convincing the supplier that it is the guilty party might be tricky. On the other hand I am not looking forwards to trying it with windows due to the licence registration process and the need to re-licence if it all goes pear shaped.
The system stayed up for some 12 hours, yesterday, with no network hardware enabled. I used it to display some stuff from .pdfs while I was doing my day job. In the evening I went to the bbc website (wireless enabled) to check on the snooker results, clicked "play in a pop out window" and within a few moments it crashed and re-booted the whole system. This is repeatable.
I am still finding my way around the bios in the Gigabyte GDR3a motherboard, it is the most complex (versatile?) board I have ever had to commission. Perhaps I am still not quite there.
Thanks for your interest.
Rans6...