XPS 14z Wired NIC Disconnect/physical connection issue

While I wait on hold for tech support I figured I'd post here and see if there's any advice.  I noticed this issue almost immediately after first getting the 14z earlier this year.  The wired NIC on the system seems to be machined incorrectly.  When connecting a network cable it will "click" into place but still not be connected.  You have to jam the cord into the port and sort of wiggle it around and you'll get a connection.  If you even so much as bump the laptop at this point you get disconnected again.  (and yes, this is with a number of Ethernet cables, different routers, switches etc etc).

So as I said I noticed this when I first ordered the notebook and Dell dispatched a tech to replace the motherboard.  I'm sure I probably tested the system afterwards and was satified the port was fixed and I don't really ever use the wired connection anyway.  Well this past week I was working from a client's office and the issue came back with a vengence.  It was a pretty frustrating week as I really needed to use the wired connection and couldn't.

What I'm afraid of is that Dell is just going to replace the motherboard again without acknowleding that there might be some systematic issue with these systems.  I think it may be systematic because when you google about this you find this (overly vulgar/juvenile) blog post http://www.terminally-incoherent.com/blog/2012/02/13/why-dell-hardware-is-***/ and a ton of people commenting with the same exact problem.

I don't want to go through the hassle of scheduling another onsite visit or worse, send my notebook into the depot, if they're not actually going to ever fix the issue.