Just a shot in the dark ...
The other day I went to charge my Fire tablet, and got a message like "your charger is wet, charging has stopped". I tried plugging/unplugging several times and it didn't help. I tried different chargers (I only have 1 usb-c cable) and it eventually started charging. I switched back to the original charger and it started charging fine.
You say Kindle Fire, so it is an old device?
Good luck.
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