I'm riding lately on a canal to a lake. Takes just over 10 minutes at idle to traverse the canal. Twice lately I have gotten a High Temperature fault with buzzer while in the canal. I shut the engine off and waited a few minutes, then restarted. The check engine icon came on, the display read CHECK ENGINE then HIGH EXHAUST TEMPERATURE, then the icon shut off and all was fine. Both times there were leaves in the canal, so I suspect the water pickup got all or partially blocked, and stopping the engine and restarting cleared it. I would think that normally there should be sufficient flow even at idle to keep the exhaust temperatures under control. I am curious if others have run into anything like this.