I have a Denon receiver, about a year old and

For Easter, I was playing music outside on zone 2 (4 speakers). After about 2 hours, receiver shut off and said Over heated on screen.

It actually screwed up my breaker, and now needs replacing. Breaker wont stay on.

Anyone know what the issue is or how to fix? Do I need a cooling fan to fix it or is something else up? I can’t imagine this is a normal thing.

The receiver is in built in that stays open all the time.