Can't connect to 5GHz band of Asus N66U wireless router.

As my title says my Xbox One won't connect to the 5GHz band of my Asus N66U wireless router. It connects to the 2.4GHz band fine, but I want to use the 5GHz because it's much faster. My modem is an **** TM822. In my router settings both bands are check as
"optimized for Xbox". I also forwarded the correct ports for the Xbox, but it still doesn't work. I tried chatting to Microsoft support, but the guy literally stopped chatting to me after he asked me a couple simple questions.

:)

 

Xbox slim wireless to ASUS RT-N66U works very poor.

My Xbox One won't connect to the 5GHz band of my Asus N66U wireless router.

 

Need help getting NAT open (running out of ideas)

So I have a Xbox one connected wirelessly to the internet. I am having trouble getting it out of moderate and into open. I have Verizon Fios and the internet currently goes from Fios/ONT -> Verizon Router/Mode, -> Asus rt-N66u -> Xbox One. I can't get
the verizon to bridge correctly so I have it DMZ to the Asus rt-n66u. Everything connects to wifi through the Asus router and not the verizon router and the verizon router and Asus router are hardwired. Everything is running the latest firmware.

My current setup for the verizon router is Wireless off, DMZ to the asus router IP, firewall on low. My current setup for the Asus is UPnP disabled, DMZ disabled, port forwarding enabled with ports entered.. I have tried all three, but have had no luck.
Anyone have any ideas that I can try to isolate where the interference is coming from? Also worth noting is that I am connecting via 5gHz due to turtle beach interfering with all 2.4 bands.

Verizon Router: Actiontec MI424WR

2nd Router: Asus RT-N66U

Network Stats:

DL speed 62.17mbps UL speed 31.48 mbps

Packet loss 0% Latency 102 ms

MTU 1480 Wireless Strength 60%

 

I spoke on the phone to an American guy and he solved my issue within minutes. To my surprise the problem was that the Xbox One was physically too close to the router and it was causing feedback which messed the connection up. After moving it at least 3
feet away it worked.