I'm having the same issues as Peenu. My build is as follows;
Windows 10 64bit (New PC with new parts and Fresh Install all drivers are up to date according to my driver software tool SlimDriver)
CPU: Ryzen 2700x (Stock Wraith Prism Cooler)
GPU: Zotac GTX 1080ti 11GB
RAM: 16GB DDR4-3000 (Crucial Brand)
2 TB SSHD Firecuda (All games run on this)
500GB SSD (Operating System and Drivers Only)
750 Watt Gold Power Supply (Corsair)
Motherboard is ASRock B450 Pro4
BIOS was up to date when I got the PC last month.
After a game crashes my PC also runs extremely slow until I either hard reset or manage to pull up the Windows menu and click restart and then it runs fine until a game crashes again. This happens quite often when I'm playing games like The Witcher 3, Conan Exiles, Heroes of the Storm, Diablo 3 etc.