GPU Driver stopped working and recovered

[Bravemaniac]

Specs:
mobo Z-91/3.1 usb
CPU I7 4790k
Ram Vengeance triple channel 12 gb {{1 Ram died, now rams working in dual channel mobo = 8 GB}}
GPU EVGA GeForce GTX 780 Ti Dual Classified
Monitor Acer B286HK ymjdpprz 28-inch UHD 4K2K
PSU 850 w

OS Windows 7 Ultimate 64bit

Symptoms:
Sometimes Skype gives me a Memory error message, While PC is shutting down.
Sometimes after restarting PC I fail to access bios, It loses connection with my Keyboard and mouse, and it even freezes in bios very rarely though.

Battlefield 4:
No matter at what setting or resolution I use, sooner or later following happens;
Game Freezes for 2 seconds and then its minimized, If you access a Task Manager, It shows that game is running and processor is loaded as its should.
After Game is minimized, Nvidia icon on right side of the Start Bar shows an error message: Nvidia Driver has stopped working.

Fixes tried:
Installed Old Nvidia Drivers, Failed.
Tracking Temperature of GPU: Often it does get up to 82 but it usually Crashes before 75c Temperature is not to be blamed.
I've updated my PC by installing new mobo and Processor Its very clean and well ventilated.
Windows has been reinstalled all the files has been removed and HDD, SSDs has been formated.

Please help I've worked on repairing PC for 3 years but Still cant find a solution
Thank you.

 

[SPgamer007]

-Check PC for viruses.
- Reinstall OS.

 

[Dario246]

Try underclocking your gpu for bf4

 

[Bravemaniac]

I found a solution I toke out the gpu pulled it apart applied new thermal paste cleaned it up
So far Its working properly
tested for 2 hour

 

[natcha12]

I had this happen on laptop, ended up doing whoilke PC refresh, all installed programs gone but it worked