GAMES NOT CLOSING PROPERLY

In recent patches, sometimes games are not closing correctly. After the post game screen, the league client opens a new tab instead of closing the old game. Once in a new game, if the old game closes out, or I manually click out my current game will close and I will be taken back to the main client page. If i try to attempt to start a new game I am told I am currently assigned to a game with no way to reload unless I restart everything.