The problem I'm seeing with this issue, for myself, is not actually pressing it too many times (that's obvious and could be prevented by only pressing it once.) I've noticed while pressing space once, if the new game has initiated on the server, but has not delivered that data to you, you're still seeing the replay from the previous match when you pressed space, before it was delivered to you, the server recorded your space as 'move ready' despite that you pressed it while the replay was still going... Since synchronization obviously has it's flaws while traveling great distances and such, I would press space once AFTER you see the "Space - New game / F - Save Replay" display after the match is completed... only once.