Why does the Redmi 2 mobile phone often report that some applications have stopped running?

1. There are too many program caches: Go to phone settings--applications--all--find the program that has stopped running--clear data; (most of them can be solved by this method). 2. The memory of the mobile phone is too low: There are many running programs in the system and insufficient memory. Go to Settings - Applications - Running and close other background running programs. 3. The installation location is incorrect: Go to settings--storage--preferred installation location--determined by the system.