Shutdown at full throttle

[Wakezone]

I have a 91 evinrude 120 on 24' pontoon. Motor starts fine and idols fine and will get going fine but after running for 10 - 15 minutes it will just shut down completely while running at full throttle. No bogging or slowing just a complete shut down from full throttle to dead. Then I try to crank it up and nothing. After sitting for 4 to 5 minutes it will crank back up and run fine again for about 10 minutes and repeats the same thing

[Thunderyacht]

Any alarms, warning lights? Sounds like it's getting hot. When was the last time the water pump impeller was replaced?