Netgear DGND3700: Netgear C3700-N600 Disconnecting from Xbox 360 Live

Netgear DGND3700: Netgear C3700-N600 Disconnecting from Xbox 360 Live
XBF Leo G,

It kicks me off of Xbox 360 Live, NOT the network. I am still connected to the network, but have to reconnect to Xbox 360 Live. (As opposed to Xbox One Live, which i dont seem to have a problem connecting and staying connected to.)

I had previously gone through the Aforementioned article about random disconnects, and still nothing worked. I DO have Port Forwarding, and UPnP turned on at the same time (this is actually how I had my old router set-up, not realizing I had to disable
one before enabling the other, but have no problems staying connected.)

I did disable Port Forwarding and UPnP before putting the IP into the DMZ, but that did not work and still disconnected me from 360Live after about 3-5 minutes. I have no problems connecting to 360Live. have problems STAYING connected.

No one on the Netgear sites seem to have an answer either.

There HAS to be some switch or something I'm missing somewhere, but can't seem to find or change, as I have my OLD Router back up and running, with the same settings of the new router/modem/gateway, and have no problems staying connected.

The only difference between the Old Netgear WNR2000 and the New NG C3700 is there seems to be no way to switch the NAT settings manually, nor does there appear to be a QoS switch which I added to the old router not knowing if it was something I had to do or
not, way back when.

Could it be something with the newest update this week? Or is there another article concerning this particular Router/Modem combo that I haven't found?

Thanks everyone for their input.

:)