I occasionally get my profile deleveled when I finish a multiplayer match (win or lose). I then have to play the next game with fewer skills and upgrades to select. playing another game usually brings my level back up to where it was originally. I think I am still losing out on the renown from the games though so it is hampering levelling as well as restricting my choice every second or third game. This affects more than one race (chaos and nids tested so far).