Sprite spawn加倍并导致力量关闭

Right now I have sprites that spawn at different times. What I'm trying to figure out is why after so much time passes it suddenly starts spawning the zombie2 in larger and larger amounts. Like it goes from a couple spawning to like 3 than 6 and more spawning at the exact same time. I thought my postDelayed would have handled that just fine and make them at a constant rate not incrementing. I'm not sure whether this is what is causing it or not but it seems that around the time it spawns a bunch of the zombie2's it force closes. (Could this possibly be related to the fact that I have the app set for 1.5? Should it be set to something higher like I have seen some others do?) Any help would be appreciated. Here is some code that is running the spawns.Right now I have sprites that spawn at differen