每次导航时，内存的使用都在不断增加。4-5分钟后崩溃

In my app,i have around 50 nib files.And i Used ARC on..means with automatic reference counting .. i used navigation controller for navigation.so With every navigation memory indicator in x-code is continuous increasing..and crash..any solution for memory management ?In my app,i have around 50 nib files.And i Used