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MOSFET FAILURE

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Hi everyone I have a new subwoofer but suddenly it turned off while playing. It's a 1600w and the volume is around 30% while playing.

It was a second day of sound test that blown it's fuse when I looked into the power supply board. I found out mosfet 4pcs 40N60M2 shorted.

As I analyze on the position of the mosfet it is not bolted into the metal frame but rather fixed on the PCB board and if I remove the board 

the mosfet is disengaged on the metal frame. In my analysis the mosfet may lose physical contact with the aluminum heatsink that's

why it overheated and shorted the junction within the mosfet. I ordered online on the parts but I am not totally sure if the same incident 

will no longer occur. I will be very glad for your comments.

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Can you add a heat sink to the transistor - is there enough room for it? A 30 ampere transistor needs a good heat sink bolted to it.. Also you need  heat sink compound/paste/grease to get good thermal bonding.

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