Rust FPS drop to 0 every 20 sec :C

I have a Lenovo Y510p with Sli graphics but Im having every 20 - 30 sec fps drop to zero.

I already disable Realtek Sound Card … the same , also I disable the grass and its the same…
Already force Sli graphics but its the same.

Any ideas why this is happening :C

PC with
16 gb RAM
Intel Core I7 2.40Ghz
Nvidia GT 755M SLI

Any suggestion I play usually with 50 with good settings.

I had the same problem when I was using a laptop, my issue was overheating.

Just disable Realtek Audio Drivers and it when fine … but no sound any solution for this bug?