Check the power connection at the battery. My fortrexx has an inline fuse there under red rubber grommet. It trips when you run it at 90-100 for more than a couple of minutes... It's kinda hard to see just a small box with a black butting on it, press it and it starts working again.
If that's not it take a simple volt gauge and see where you have power and where you don't. Not much to it, you can probably figure it out and save hundreds.
Sounds exactly like what happened. Just went out there and checked it and now it works. Lol.
Awesome. I learned this the hard way, had my boat for one week, was running thru a shallow cut on EM and the thing just turned off. Spent an hour on the water and an hour in the garage before figuring it out.
Had to cut the trip short and all. Something so simple.
Hopefully that saved you some cash.