v1.8.0 Screen freezing.

[AlphaMike01]

When I start playing the PR it runs normally, without crashing, without lagging, it runs perfectly, but, a few minutes of playing, the game simply FREEZES the screen, the sound of the game itself, is in a loop (probably bug), but the sound of the players' voices continues normally and to solve, just turning off the pc on the power button solves the problem.

I've already done these actions:

1: Remove video drives from the previous card. (use now, integrated video card)
2: I put priority in the game
3: I tested different resolutions.
4: I removed custom resolutions.

My pc:
i5 3470
8x2 of Ram
SSD

The pc runs the game perfectly, no lag, no bug(other types), no crash. pls help me guys.

I really enjoyed Project Reality.