Frequently when you go to start a game you get the "assets haven't loaded" ... codeword for our advertising loads to damn slowly. The problem here is that when you need to refresh your browser it reconnects you to the game really quickly - but the UI is all screwed up and laid out poorly. So you refresh a couple of times until it quits trying to auto-reconnect to the game, wait a moment for the UI (the advertising) to load, then you can rejoin the game properly. Please fix your performance issues, thanks.
[BTW, this doesn't just impact rejoining games - it impacts rematching with bots, and starting the game with the bots too quickly, not giving time for the "assets" (advertising) to load again]