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If your internet connection is slow or doesn't work as it usually does, it may help to restore the factory default settings. Please note that all settings in your router are deleted during this process.
Restore factory default settings
Turn the back of your router towards you.
Insert a sharp-pointed object (such as a paper clip) into the small hole below "Reset" and hold it there for 10-15 seconds. Wait while your router restores the factory default settings.