Had the same thing happen on mine. I do electrical work and I can tell you that wire nuts are fine but one of the hardest splices to make is joining a solid conductor with a stranded conductor. The transfer switch comes with stranded wires to be more flexible and to not break the plastic mounts on the transfer switch when the wires get stuffed down into the box. It takes special care to screw the wire but on to both wires making sure it's not just pushing one wire out of the way as it screws down on just the other wire. When this happens you have loose connection. A loose connection will not carry the full load. It will heat up and scorch the insulation and can lead to a fire if nothing else fails first.
That new style switch with rigid connection terminals sounds good.
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