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the fans might not be running and if the fans are running then you need to keep the amp cool by letting it have access to the a/c or air from the windows. think of it like if you keep your body in a box for a long period of time and there is no air circulating then your body heats up same thing an amp need air circulating to stay cool.
sounds like you are overheating the amp, if the amp has a fan to cool it off, make sure it is turning on and working... if it is not then replace the fan to fix the problem...also turn the amp gain down a little bit and try running it again and see if it still shuts off...if it doesn't shut off then you have teh gain to high and are cutting out the amp with to much power going thru it...
Sounds like the thermal protection on your amp is doing its job. You can put an external fan in to help in cooling, like the crossflow type shown here, or a couple of muffin fans like these (look familiar?). You may have fashion a bracket to mount the fan(s), but that shouldn't be too much of a problem. Many fans are shipped with mounting tabs attached.
As far as I know, no amplifier runs the fan after the remote turn-on voltage is switched off. If the protection light it lit, the amplifier is probably damaged. If it's brand new, you should return it for repair or replacement.
you trouble shoot the problem by opening unit and force-powering fans to test for overheating during "being used loud for a few minutes". Read the fans' label for proper voltage to apply and proper polarity. I am guessing the fans will run on car battery voltage of 12 volts. Also, attempt to close up the unit to simulate real conditions.
There should not be fuses for the fans. If unit is now cooling, then look for faulty thermistor, which turns the fan on during rising temperature. Once thermistor is located, a fast test is to "jumper" its two wires to simulate turn on.