Alienware 15 and 17 melting DC In cable

[DDebbil]

I had an Alienware 17 R2 a few weeks ago that I had to return because the cable that runs inside the machine from the power jack to the motherboard had previously melted and been replaced, with the result that the bottom case plastic that sits directly below it was also partially melted (the seller didn't mention this until I got it). Last week, I bought an Alienware 15 R2, and when that turned up, I noticed the same localised blistering on the lower case plastics, and when I opened it up, sure enough, the DC cable looks like it has been very hot, and the plug where is goes into the motherboard has discolouration and maybe partially melted.

 

So now I'm thinking this is a design fault with this generation of Alienware laptops. I've done some googling around, and other people have definitely had this issue, so I'm surprised it isn't being officially called a design fault. I'm wondering if anyone here has one of these laptops and has experienced the same thing?