App Crashing while executing in iPhone

I am trying to execute the mobile app test cases in iPhone 5s (10.0) using Appium 1.6.0-beta1.It taking more time for execution.And while executing in some test cases the app is closing suddenly.Also cannot predict the test case where crash will happen.If I debug only particular test case it will work and if I execute with all it will not execute app will close.Can anyone help me on these…