I've played three competitive matches recently and the last game I had a bug where players could not choose their loadout but only spectate. People didn't know how to fix that so many just left when we were in a game waiting for the rest. Almost 120 seconds past and it told us we could leave without penalty. I didn't leave but the server kicked me out at the end - banned me for 120 minutes due to leaving a "ongoing match".

-- You can fix the bug (where spectate is only option) by rejoining the competitive match through the play menu within 120 seconds.