I by no means am an expert, but you have tried with different cables / leads and still have a problem which 9 times outta 10 is the problem. You could maybe try leaving it connected for a bit longer to see if that has an effect (few hours). Maybe someone else could offer a different approach
But I feel the outcome maybe that you will have to send a message to email@example.com and explain your situation and provide them with your serial number and order info, if it’s within last 18months then you will be covered under warranty. Anker has the best customer support around so they will sort you out.
I’m hoping when you say rinse it you don’t mean with water