To fix the issue:

1. Use compressed air (gently) to blow into the connector to remove liquid or loose debris. Alternatively use a straw and blow directly into the connector.

2 . Clean the connector with clean water and paper towel cut in tiny strip. Dispense water gently via drop directly into the connector, and remove them again with paper towel strips

3. Let it dry: leave the connector alone for 6hrs so it can dry out before charging. Using the phone in this time span is ok as long as it's not charged.

If charging is needed urgently, use wireless charging (S9+)

Be aware that the charge cable connector can be contaminated with salt/ or rust. Therefore it need to be gently cleaned as described above . Else it can transfer to the phone, and cause the issue again. Or cause the issue while connected to the phone.

If there is fabric fibers inside the connector, these can be removed with a needle by scraping the bottom of the connector. Use magnification during operation is best.