Put my 2021 GTI SE 170 in the water for the season, started it up at the ramp normally and everything was fine. Stopped on the way home, turned it off and back on and nothing was abnormal. When I got to my dock and pressed the start/stop button to stop the engine, I got a long beep and battery warning light. There was also a sound coming from the engine bay that sounded like a pump or fan running (fuel pump?). Tired to start it up again but nothing would happen, not even a click. Pulled the Key off, but the noise continued. Quickly got a screwdriver and disconnected the battery. Then tried to reconnect the battery and as soon as the 2nd pole is connected, the starter engages even though the key is off. Tried again today and same thing happens. Is it a bad starter solonoid? Bad ECU/MPEM? Starter itself is clearly fine because it tries to turn over.