Power Cord Heating Up Common Problem?

[GypsyCliff]

We've recently purchased a used Newell Coach and have a few things to work on.

The most worrisome is the very warm power cord that heats up when the AC is on. It only heats up at the plug and the first 6 inches of the cord so there is some resistance building up there. We are talking hot to the touch, like

I've cleaned the plug prongs but there is not much else to do.

I'm considering cutting the cord back about 12 inches and re splicing a new plug on as I'm guessing the old plug is a bit worn from years of use and may have some damaged wires thus causing the resistance to go up.

Is this a common problem?

Thanks,

Cliff