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Hello. My name is Tan.
Can you run the engine on a different fuel source like a 5 gallon gas can? This is symptoms of debris in the fuel tank blocking the fuel pick up tube screen. Running on a different fuel tank will eliminate the boat side fuel system as a possible cause.
There is a screen on the end of the pick up tube. The fuel supply line has a anti siphon valve that can stick. It would make any difference if the boat was flat or not. This is why it acts like it is debris rolling around in the tank and only get stuck on the pick up tube when you are at an extreme position.
The only thing on the engine that could be an issue is electrical. Check the main plug that connects to the engine wiring harness. If the plug works loose it can loose contact when you hit waves or go into a turn.