Got a bug after getting disconnected from a game.
Internet went down, and when I got online again, I was able to rejoin the game without restarting steam. After some time in the game (possibly more than the 5minutes cap for reconnecting), I got kicked with a message saying I wasn't logged on steam and a "dismiss" button. I shut off Dota2 + steam, restarted them and couldn't join the game again.