TheMuff1nMon

Disabling UPnP and forwarding these ports manually http://support.xbox.com/en-US/xbox-one/networking/network-ports-used-xbox-liveseems to have alleviated the issues. For now, still needs to be addressed though!

I'm having lag issues about every other match. Random lag spikes where all I see is people running into walls or my respawn timer gets stuck at #. I have Time Warner Cable, 37 download, 6 upload. No connectivity issues or problems with other games just Halo 5. I know for a fact others are having this issue, as I've discussed it on the Halo 5 forums and on reddit on the Xbox One subreddit. Here is a link to that discussion to add to the reddit post you've already referenced. https://www.reddit.com/r/xboxone/comments/3qdwxa/halo_5_lag_issues/