Have you rebooted? My guess is that the USB port or charging circuit has been damaged. Try cleaning the port with a soft toothbrush or CAREFULLY with compressed air (while the phone is off).
Have you rebooted? My guess is that the USB port or charging circuit has been damaged. Try cleaning the port with a soft toothbrush or CAREFULLY with compressed air (while the phone is off).
Doesn't mean it's water, it might be just dust or sand. Still try to clean out the port with a brush and if that doesn't help and if the message is popping up without anything being connected to it, then I'd suggest taking it in for repair as it's most likely the charging port.