I’ve had it put me to the main menu when you join a server thats finishing its game. That’s a pretty common bug.
I’ve had the game randomly quit to windows without warning before, that’s another common bug.
I’ve had the game kick me due to security violations, that’s a common bug.
But just now I was in a game and mid game it puts me to the main menu without warning. I wasn’t kicked, wasn’t a security violation, wasn’t lagging or having connection problems, and the game did remain open, it simply just disconnected me from the server.