Premiere Pro CC 2015 and Nvidia Quadro K600 problem

When editing video with Premier Pro all videoplay stops working sooner or later, sometimes even after one minute editing. There's no error message, everything else works, but video is just black, audio still works. And if you try to export during this "black video", you get an error message "Error compiling movie. unknown error". This problem may also come during exporting and then that error message stops the process. When you restart Premiere it works again for a while.

If you change "Mercury playback engine software only" instead GPU acceleration (CUDA), it works, but slowly.

I have windows 8.1 and Lenovo Thinkstation E32 and I have updated the latest version of Nvidia Quadro K600 driver, it didn't help. I have also updated all newest drivers including BIOS and Windows updates.

Any ideas what I should I try next?