Cockpit black zones and extremely low fps

Hi. After i did some flights with the pmdg 737 ngx i get this error.
The scenery load extremely low (some buildings are black/runway and no runway markings until few minutes after)
After loading, the cockpit stands with black parts for ex the knobs, fmc keys, etc.. i can see the pfd, fms and ap digits.
With the same cfg i get about 8 fps (before it was about 28 fps)
I dont remember changing or install/uninstall anything.

I have tried :
To move prepar3d.cfg, dll.xml and exe.xml (program data and roaming directories),
both Prepar3d_Default.fxml and .wx in the local directory, scenery.cfg.

This happens with all planes and all airports i have tried.
For 1 sec i can see sometimes the entire plane (f22) then black parts again, i suppouse it is not a texture issue.
I have update p3d to the last version without working. 
Any ideas? I have update nvidia drivers , maybe is it the problem or windows 10 files updates?
Please help, thanks.