R8000 Slow download speed on wired and wireless connections

The Energy Efficient Ethernet setting was disabled.  That was not problem.  The problem is with the router as discussed below.

Becuase I have been unable to solve the problem, I called Netgear tech support.  After about 2 hours on the phone with them and my ISP, tech support decided that the WAN port was broken. They sais they maybe a borken "wire" affecting the performance of that port. Because it is over one year old ithe router was out of warrenty and that I would have to buy a new one.  They did not offer a reconditioned one or to repair it when asked.  Support said there is nothing they can do.

One additional piece of information that I did not mention here but did discuss with support is that this problem only surfaced after I upgraded my download speed to 300Mbps a coupole of weeks ago.  My previous download speed was about 50 Mbps.  So my problem may have been there from the time I purchased the router.  It was my opinion that the problem was there from the beginning and only after getting the higher download speed that it was detected.  Tech support did not buy that argument.  So I asked tech support how does a "wire" get broken; they could not answer the question. So I'm left with a a problem of not knowing if the problem is a manufacturing defect or something I did?

I appreciate the effort made by tech support to help solve my problem but left wondering about the quality of the product and their willingness to stand behind it.  

So i bought a competitor's router, a brand that I had used for years and upgrade routers as the technology advanced and never had a problerm with any of them.  The new router gives me great download speeds both wired and wireless (> 250 Mbps).