Fun but very unstable

So, I do enjoy playing this game very much and have spent a few bucks on gems to purchase upgrades but, this game is so unstable that I keep getting booted out right at the end of levels. Heaven forbid that I dont save my game and lose ten goddam levels and a bunch of gems. I see other people complaining about it being too difficult but, I just want it to work and save my place within the game! Its not my wifi connection or my LTE because all of my other games work fine. Please fix this game!

Garage zombie about Samurai vs Zombies Defense, v3.4.0