The app is using an SKEmitterNode (please see my question about this below)
https://stackoverflow.com/questions/31991350/skemitternode-not-acting-consistently
The particles don't emit consistently. In the scene where the particles don't emit, about ten minutes into gameplay the app crashes, with this error: Thread 1: EXC_BREAKPOINT (code=1,subcode=0x1004cd474)
then the particles emit every time no fail. Whats going wrong??
Problem sourced to a single zPosition in another function causing the emitter to be either hidden underneath or causing app to crash.