I'm getting frequent simulator crashes and can't figure out what is causing it? Any suggestions on how to determine the root cause?

Error in console simply says the following:
Session did end with error Error Domain=DTiPhoneSimulatorErrorDomain Code=1 UserInfo=0x100128720 "The simulated application quit."

I have a simple 3 tabs (3 windows) with tableviews in each window which create new windows when you click on a row which shows additional details about the row clicked. Is it because I'm not removing windows when clicking on multiple rows?

Can someone provide an example of when to use remove? I seem to be mostly adding stuff but don't know where I would remove something or in what scenarios. Please Help!!!