I can log into Xbox Live and play a game for approximately five minutes before the game is disconnected. Everything worked fine for over a year and then suddenly out of the blue it no longer works. I played for many month without trouble then suddenly it no longer works.
I'm using Comcast Xfinity into cable voice modem RCA model DHG535-2. I have a Netgear WNDR4000 router with UPnP turned on. I am using a WIRED connection. There are no errors when I check the connection, NAT is open. After running xbox live connection test which says everything is fine i get the following values: