I had been using Win 10 (ver 1709) with 9.1 mostly fine and stable. Then auto upgraded to 1803 by Microsoft (as it does). Around that time, thought nothing much of upgrading to CUDA 9.2. Then started having lots of instability (freezing intermittently, including mouse frozen, and after a minute or more, would unlock … to happen again at some point). TdrDelay etc. all set correctly.
I thought it was Windows … so tried full reinstall of Win10 1703 and then Win10 1709 … same problems. Realised it might be CUDA 9.2 … so went back to CUDA 9.1 (which also included reinstalling everything), but with Win10 1803 now (was 1709 originally). and back to stable again. So I think it’s CUDA 9.2 … and I think it’s the new packaged GeForce drivers, although I’m not sure. I usually don’t upgrade or change the GeForce drivers that come with the CUDA package. I also think it might be because of the older hardware (x79).