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Cause 1 of 3: Too many applications open
If there are too many applications open, it may cause an application not to respond.
Solution: Close one or more open applications.
Find "Active"
Press the Shortcut key.
Press Memory Manager.
Press Active.
End active applications
Press End next to the required application.
Return to the home screen
Press the Home key to return to the home screen.
Or select...
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