If the malfunction is severe or the device does not work at all, try the following:
Turn off the device using the power switch. Wait approximately 10 minutes, then turn the device on again and test it.
Check the casing for damage such as cracks or bite marks. If damaged, the water tightness may be compromised and the device should be sent for service.
If no LED lights are on and the device does not respond, connect it to a charger and leave it charging for 6 hours. Then turn it on normally and test again.
If the problem persists after these steps, send the device for service using the service form:
https://natlink-serviceform.web.app/