Earlier in the thread a poster mentioned a loose return leg getting hot. That was a good observation, loose connections will burn quickly. Vibration and stress can loosen things up.
If anyone wants to try something for a permanent fix, look up 'potting compound'.
In the Air Force we potted plugs that were susceptible to moisture or vibration. Then you would only have to worry about overloads.
A boater could buy a good quality plug, assemble it correctly, tighten everything up, test it, then pot the hell out of it. A soak in MEK (methyl ethyl ketone) will melt it away for replacement or repair.
Just thinking outside the box a little bit.
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