Annoying error moisture help

The issue could be a few different issues.

1. The could be debris such as lint or dust in the charging port, that has trapped some moisture in the port with it, and it may need cleaned out.
   1. The process I use to clean charging port for my customer is:
      1. Use fine tweezers to break and dust free from the charging port, being careful not to damage the pins of the MicroUSB connector.
      2. Then spray canned air into the port, likely blowing the dust out.
      3. Use a toothbrush and alcohol to clean any corrosion or remove any remaining dust.
      4. Finally spray canned air in the port again to dry the alcohol, you may want to let the device sit for a few minutes before plugging it in to ensure it is dry.
2. I have seen on many Samsung phones that if the port is exposed to a little moisture this notification appears and the only way to get rid of it is to replace the charging port.
3. It may have sense some moisture, if you were in a humid environment and may dry out on its own over a few days time.