You may be overloading the amp with too much subs or to low of a ohms load that it can handle and setting it to maximium setting.
Possibility is also it is poorly soldered internally and a solder bead has short circuited the circuit board. So no matter how many times you replace the fuse it blows. Or a small metal object got inside and caused it too short too!! Send it back to Manufacturer if you got warranty or else open it up yourself and investigate the problem see if you a burned tracer and reconnect it or a burned component like a resister or capacitor and replace it with the same value at Radio Shack. You may have to learn how to solder, desolder using a pencil soldering tool. The Soldering gun is too strong and may damage it further unless your very skilled at it.
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