What do I do if an app isn't responding?

Please try the following:

1. When the prompt appears in an app, close it and go to Settings> Apps> See all Apps> Find the App> Storage & Cache> Clear Storage and Clear Cache, and try again. Be sure to back up any important data before clearing.
2. Close and clean any unnecessary background programs properly.
3. Restart your phone and try again.
4. If the developer options are enabled and the phone shows 'Application not responding' (ANR), turn off the developer options.