Crashing problems

When I downloaded the game, it was really fun to play on the first chapters. When I went on the second one and went on the mission to get booze for the Seahorse guy, it suddenly crashed a few times when I was collecting the booze. After those few times it was okay again. Then on the third chapter, when I encounter a zombie, it just crashes. It has happened many times and now I cant play the game. I really like the game and its fun but its just hard to enjoy it when I cant play at all :( please fix the crashing problems!

WildBeech about Zombies Ate My Friends