try lowering the wattage of all the bulbs. Man that is alot of light power.
I am not qualified in this area, but I am sure someone else will come in for you, but, I would sure not use the switch any more.
Sounds like your pulling so much amperage and wattage that the wires are not big enough for the task. Are the wires the same diameter as the in house wires in the junction box?
I will see what others have to say on this.
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