I crashed randomly ingame after placing a miner. When I reloaded my game the waves wouldnt come even if I called them and my miner would keep mining. I left my phone on all night and got a decent amount of resources for my low prestige level. I've crashed before from placing miners but never got waves to stop. I noticed after selling crusher there was a regular that never died maybe but when it did the waves still didn't come. The crusher is probably what broke it with combination of crash I think. I never crash on 6.3 for whatever reason. I crashed on level 4.4 and I was playing on easy. I've crashed on other levels but that's most recent crash.