You say the steering works normally, that tells me TX communicating RX, binding is fine. it became glitchy. and lost its memory.. Redo you Calibration on ESC, learning theb position of Throttle, Neutral, Full throttle, and Brake. Also reads where the brushless motor bwhere is at. Hobbywing calibration procedure. Electronic and water dont mix. Us Nitro guys leaned how to waterproof our RX by using a water balloon, zip ties and shrink tubing back in the mid '70 from fuel leakage.