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Did you check to make sure the amp is stable at what ohms you have the sub?
Of course check all connections and grounds again, and make sure that ground is good!
The 15's could be trying to pull to much power, causing the amp to go into overload protection. Try to play them at a lower level volume using the same song and slowly work your way up and see if the amp cuts out then.
Also is it cutting out even if you get right into the car after it has cooled down?
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