Rustafied a team in close relations with Garry Newman and his Dev-team announced on live-stream, here at time 42:00-43:20 Twitch
That Garry Newman personally said that [Bug/operating system crash,slow down]is caused by your Unity 5 Engine and was submitting a ticket for resolution.
I understand that sometimes problems arise and they eventually get fixed. Can you please shed some light or even validity to Garry Newmans claim?
here is a link to his forums with a little more specifics if necessary: http://support.facepunchstudios.com/feedback/view/5161-internet-and-windows-stop-working-properly-after-closing-rust
I apologize in advance if I am in the wrong place.
Known issues with Unity are all publicly-available on the issue tracker: http://issuetracker.unity3d.com
If it’s been recognised and reported as a Unity bug it should be on there - ask Garry what the ticket number is and you can vote it up for faster resolution.
This is most likely not due to Unity, because it comes and goes with patches to the game. It could be one of the plugins they used when developing the game.