Guild Wars 2

Hi!, i got a really strange problem which i had for quite some time now.

I get around 20 fps, no matter settings or what i am look at, in Guild Wars2.
If i use Display Driver Uninstaller, to clean all traces of my display drivers, and then reinstall my drivers, i get full performance again, for a while. It takes like a day or so and then i am back to 20fps again and i have to reinstall my display driver again to get back the performance. All other games works fine, except for Tera which is also affected by this issue. Both My Titan Blacks runs at 100% at 1124mhz (EVGA superclocked) at 20-30fps when im affected by this issue. After reinstall of drivers with full performance i get 60fps and GPUs are at 40-100% depending on where i am and looking at.

My Computer:
CPU: I7-4970K
GPU: 2X Titan Black SLI
OS: Windows 10 Pro (Had the problem when i ran 8.1 as well)
RAM: 16GB DDR3 1600mhz
PSU: 1200W Corsair
Display Driver: 355.80 (Hot Fix for SLI)
Latest Intel Motherboard drivers installed.
Philips 4K Monitor (60HZ), (but i tried 1024×768 and still have low fps)

Anyone who got any idea what i should try next? Re-installation of windows has been done a lot of times and the issue always comes back.

Thanks in advance for any ideas.

ups, sorry was meant for technical problem forum.