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If your device isn't working properly, you can try several solutions to solve the problem.
In most cases you can solve the problem by following these guidelines:

The device isn't performing optimally

Cause 6 of 6: The device is overloaded for unknown reasons

If your device, for unknown reasons, gets slow or doesn't work as it usually does, it may help restoring the factory default settings. Please note that the configurations and content you've added to your device yourself may be deleted. Therefore, it's a good idea to back up your device first.

Solution: Restore factory default settings.