RAX78 WAN port keeps asking for IP Address from gateway/router/firewall

I finally gave up on waiting for Netgear support to come back to me with answers to my case number!  I swapped back to production the Nighthawk X6S R8000P which was replaced by a RAX78 with bad WAN port.  I reset the RAX78 to factory default and plugged in the WAN port to a DHCP server from an old router.  The same thing, it continuously renews/releases the IP address that the DHCP server is giving to the WAN port. So it proves that the WAN port is bad in that it does not retain the IP address given by the DHCP server.  I was able to use it for a week because I hard-coded the IP address of the WAN port. 

My ticket with Netgear support was asking them if there is a fix for the WAN port issue.  If there's no fix whether they are going to send me a replacement or I will return it to Costco.  No response after one week.  So I took it down and I'll return it. 

I will probably not buy a Netgear product again.