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Xbox downloads slow

ellison65
Newbie
Posts: 4
Registered: 14-08-2015

Xbox downloads slow

I have Unlimited Fibre Extra, and over wifi last week, I was getting 40Mbps downloads on my Xbox One. This week I seem to be stuck at around 15Mbps, and yesterday was closer to 5Mbps. The connection itself, over wifi, is just under 50Mbps with 95% wireless strength and 0% packet loss.
My 360's download speed is just under 4Mbps, signal strength is 100%, again no packet loss. 360 says "wifi speed 5Mbps" which I'm not sure of.
Both have upload speeds of 18Mbps strangely.
I've done all of the xbox troubleshooting, I've created static IPs for both my One and 360, and opened all the necessary ports for both consoles. I'm using an Archer C9, so I have something called NAT Boost enabled (rather than QoS).
I'm proper confused about this. I know a wired connection would be a solution, but that's not viable at the moment.
Anyone have any ideas?