abrupt stall

I bought this boat about a month ago. Upon doing some research I keep seeing similar issues with carbureted engines, but mine is a 4-tec efi. Start/ stop is flawless, it runs fine for a while, even at speed and planing, but usually about 40 minutes in it starts to sputter and die. This happens...

Any suggestion for sudden stalling ? Starts easily- runs well under load then immediate engine shut down 2-3 minutes later. No bogging or hesitation. Will not crank unless key is removed and replaced. Then will easily start and runs well for 2-3 minutes. Are there any sensors that will...