Rust - Crash or Freeze

Hey,
Since the new update of Rust, my PC crashes after 3-5 minutes. And when i dont get crashed Rust get closed without any errors. Also when I play on the lowest settings Rust get closed.

PC-Spec:

Intel-Core i5-2500k @3,3GHz
8GB Ram
Amd Readon HD 6900 Series
OS: Windows 7 64bit