Wipe Cache
I not assure you that this procedure will have a positive end, but try not harmful.
Turn off your Android smartphone / tablet and on again while holding down the buttons
power button,
Volume + button,
central home button (if present)
When the terminal reboots use the volume buttons to move up or down in the menu.
Scroll to Wipe data / factory reset and press the center key home (or the power key), in the menu that appears select Yes - delete all user data and press the center key home (or the power key).
If these solutions are not sufficient, the ultimate extreme solution is to perform a hard reset of the Android device.