Yup, same here.
Doesn't happen to host, and it doesn't happen if I'm with the other player (my brother). So I figured lag.
Tried it over LAN and the same thing happened. We're using ventrillo that wasn't over lan, if that helps.
It's like a invisible zombie that randomly kills anyone who isn't host, it also seems to randomly destroy his cars for no reason, sometimes slowly over time.
Because of this if we can't find each other in time the zombie randomly kills him, so splitting up is a no go.
Is there anyway to make us spawn together always, or is it random?