Hi i've seen a bunch of you posting on here that the program crashes because you've added to many people. Its most likely crashing (like computer programs do).. when there is not enough memory to run your program. To solve this... double click your home button fast then hold down ur finger on dream zoo app that appears in bar on bottom. then click the minus button. This will complete close down the program. then just rerun it. You may need to do this every single time it starts crashing. but it should crash ALOT less. Alternatively you can reboot you phone and it should run fine for a while.