All of a sudden (or maybe after a recent firmware upgrade) my Xbox One will not maintain a connection to allow for multi-player or first person shooter games. Have tried multiple games (Overwatch, Modern Warfare, Rainbox Six-Siege) and none of them will allow for this. All was fine until about a week to 10 days ago when Verizon pushed out some updates for what I thought was the TV platform which changed the guide, and other on screen experiences, and now wondering if they also pushed something for the router as well like a firmware upgrade. I also have a PS4, which continues to work flawlessly and is lightning fast with no lag, no trouble connecting, etc. along with multiple other devices connecting both via ethernet and wireless and they all appear to be working just fine. I get error in Xbox Settings stating that NAT type is Moderate (when it's always been Open) and that uPnP is working. I've logged into myfiosgateway and ensured that in fact uPnP is toggled on. I have a G1100 Quantum Gateway. Things I've tried are below: - Hard Boot XBox Console - No Change - Tried Ethernet with Xbox as well as Wireless. Xbox detects the wireless connections and connects to the wi-fi, but still unable to play multiplayer games Toggled uPnP on/off, rebooted router, rebooted console attempted again, no change Factory Reset the Router, hard boot console, re-connected, no change. So I wondered if it was actually an Xbox issue, so I used my Verizon Cell Hot Spot as an alternate Wi-Fi network, Xbox connects to that just fine, and multi-player games work just fine, no issues. Which tells me that it's something with my Verizon G1100. I have read all sorts of blogs, posts about Port Forwarding, MAC filtering, etc., but that doesn't explain why this just happened all of a sudden. I find it hard to believe that evvvvvvveryone who got a firmware push/upgrade that's using a G1100 and has an Xbox is having these same issues. Is it possible that I need a replacement router? Is there some other setting I should have enabled? I would assume that since other devices are OK the router is still OK? At this point, I just want Xbox to work like it was 10 days ago when it mysteriously began to NOT work which happened to be when FiOS put out an updated all services rebooted and I saw a change to the TV Guide and other TV interfaces. Help!