Cannot stay connected to Xbox Live on Xbox 360
I haven't had UVerse even a year yet. I own Xbox one and Xbox 360. Xbox one connects just fine, but 360 can't stay connected for more than a few minutes before I get disconnected from Xbox live. I know the gateway I'm using doesn't have UPnP support. Which is the 3801HGV gateway. I know I have to have one console off if I'm using the other to keep my NAT settings open. But now the 360 can't stay connected. Help?