> onboard 10G Marvell AQtion ethernet
I had similar problems with an Aquantia 10GbE NIC (which AQtion appears to be the rebranded name for, post-acquisition by Marvell), and it turned out to be the network chip overheating because it was poorly thermally bonded to a VRM heatsink that defaulted to turning on at something like 90C. Adding a thicker thermal pad and setting the VRM fan to always be on at 30% solved my problems.
I think it probably isn't the same problem, though, because I only have stability issues at initial startup. If it boots and doesn't BSOD in the first five minutes then it's fine... even through heavy network and disk use (like installing updates).