Game crashing..

Im always using bloonstones that I buy and or get from the game. I use the supply drops to get extra money during the game to help me out. However I use about 15 bloonstones for that and whenever I put down spikes the game crashes and I lose all the bloonstones I had too.. I lost about 200 bloonstones now. Please fix this. Its getting irritating. It crashes too much.

CallMeGeoTron about Bloons Monkey City, v1.11.1