As the topic states after the latest patch to SC2 you lose lives at random and lose the game because of it. It would seem when there is a larger(size of the unit) creep wave that spawns it triggers the portal that causes you to lose lives at the same time. I love playing this TD and would like to see this bug patched. Thanks! P.S. The settings you choose do not appear to matter. Maybe Blizz altered the size of the units box? I don't know how this works.