Appears you have a "high resistance" connection.... i.e., a crappy one -- that is acting like a toaster.
So either you're pulling too much amperage through the wiring (undersized wire for the load) -- or the connection is not capable of carrying that load. That could be due to a bad connection... or the connection is "opening up" because of the high load (think warping metal due to heat).
I would check the draw on that circuit... because the bad connection MIGHT BE your GROUND - rather than the + side of the circuit. A bad ground will be every bit as important as the actual power side! Don't over look it!
Many people don't understand the length / gauge / amp carrying charts.... those charts need to be DOUBLED on the length of the run. It's a CIRCUIT --- so if the load is 10 feet from the source -- it's calculated as 20 feet! When you use these charts correctly - the gauge of your wire will finally be ample for the load.
Good to finally meet you at OUSCI! Sorry I was really too busy to chat much.
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