[Crash] Crash (Steam too) to Desktop after being ingame for a few minutes

Hi,



I'm running this system;



MSI Z97-GD65 GAMING Intel® Z97 ATX Motherboard

i7-4790K Quad Core 4GHz 8MB cache

32GB DDR3 2133Mhz Memory

4GB NVIDIA GTX 980 Gaming GPU

120GB SSD

1TB SATA III 6Gb/s, 7200rpm, 64Mb Cache, 8ms Hard Drive

Windows 10 Tech Preview 64bit



When ingame everything runs lovely, good FPS, looks great.



Problem is that after a few minutes ingame, varying from one or two minutes, to sometimes 20 minutes, my game will crash totally to desktop, as if I had ended the process, with steam also vanishing as if I had ended the process. No .dmp file is generated. This happens for both RO2 maps and RS maps.



I've tried every compatibility mode, tried various combinations of high and low settings. I'm running the latest drivers for everything, fully updated windows. I've installed and reinstalled the redists. I've verified integrity of game cache. I've tried both in and out of the steam beta. In nVidia control panel I tried disabling CUDA because I heard that might help. Nothing has made any difference.



Any ideas of what I could try to fix this?



Thanks.