The receiver is shutting down due to heat.
IF you do not want to change anything..Get a small muffin fan ... two would be better, and blow air up from under the receiver. It will help cool it down enough. And since you are playing pretty loud, you will not hear the fan anyway.
You can get A/C ones, or if you got a small power supply with a 12 volt out you could use some computer ones with speed controls.. (for use when playing at lower volumes (if ever) Or a A/C motor fan spped control at moat hardware stores. (I added one for my kitchen fan.. worked great.)
IF you do not want to change anything..Get a small muffin fan ... two would be better, and blow air up from under the receiver. It will help cool it down enough. And since you are playing pretty loud, you will not hear the fan anyway.
You can get A/C ones, or if you got a small power supply with a 12 volt out you could use some computer ones with speed controls.. (for use when playing at lower volumes (if ever) Or a A/C motor fan spped control at moat hardware stores. (I added one for my kitchen fan.. worked great.)

