Soldato
I found that out by accident and was going to post something similar to you but saw yours, the problem I have is I keep forgetting to do it at the end of the game and get the looping it does seem to sort itself eventuallyAbout the menu-loop bug: If after EACH game you go back to the DM menu of COD MW (where you can choose the type of game you'll play) intead of waiting for a new game, the bug don't happen. It seems that the game is returning to the wrong menu (Warzone instead of DM) and this is causing the bug.
This is NOT a solution (it's not only a hassle but also makes you be punished, i.e., from time to time you'll be put into already-in-progress games where your team is losing), but at least it's a way to play until they send a new patch (to solve this bug and break something else).