On my end it appears to be Speed of Sound. disabling it fixed the issue.
May 10 2016
Here is a video, Adam. https://www.youtube.com/watch?v=fH2AYJTLAPE
Or CUDA. the way to check is that the people suffering the issue disable those two in the drivers, or one of them, then the other, and see how it effects the driver crashing.
I had this unbearable issue as well. I've managed to solve it temporarily by disabling PhysX and CUDA on the card through the nvidia control panel. Obviously this is not a proper solution, but it might help isolate the issue.
May 9 2016
@tuplas That solved the issue, thank you.
I use a Saitek X52 Pro and in build 72.107486 the issue is not resolved. Helicopters still only start up with the throttle at 50% and only responds to inputs at 50% and higher.