Nvidia drivers have been a mess whereas before they have been stable.
They need to do what AMD did with Crimson and rethink how they are made. Churning drivers after drivers clearly isn't working for them, it's plagged with Quality Control problems.
But that's exactly how "Crimson" drivers are made. If anything Crimson driver is AMD doing what NV has been doing for years now - releasing a new driver when a big AAA game is released.
Some QA issues stem from the fact that there's a lot of stuff going right now - a new Win10 WDDM2 driver base, DX12 driver, Vulkan driver, Pascal drivers - all of this is hitting at the same time basically so the resources are stretched thin at the moment. It'll get better once we'll be past the initial launch window for all of these.
I have been having problems recently with the drivers locking my cards clock's at 2D speeds. It seemed related to my Windows Build as well (Which was the latest Redstone update)
After reverting back to the previous slow ring build AND updating my drivers for the Vulkan build 364.91 Beta it seems to have been solved.
Redstone is a beta as well and there's no guarantee than anything in it will work properly.
I also hate that the Nvidia control panel is getting slower and slower and clunkier and that we are getting more and more "helper" services running related to the drivers, even when we don't install the GeForce experience app.
Eh, I'm not really noticing it getting slower but it is certainly slow right now and they do need to improve it. But as I've said this will probably happen once Pascal is out at least.