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Whenever a game is finished and goes to the next, everyone stays at the same team. I think when a game finishes and goes into new game, the team select menu should come up so they have to choose a team again. That way not everyone will be in the same team everytime. This'll make a game more balanced as you won't have a team of pros and a team of noobs.
This is controled by g_maintainteams variable on the server side. So ask your server admin(s) to change it to 0.