Horrible Performance issues with Multi-users - no it's not my Internet connection

Thanks again Furry!

There's pro's and cons to the setting a device static IP, the main pro is that if your router's DHCP software is sketchy.

Whilst DHCP 'can' change the IP address, I've never seen it happen and the advantages of having all device IP's controlled centrally has always been more appealing to me. DHCP reservations are just 'safer' and avoid potential boob trap scenarios that can happen with devie specific static IP addresses when things go wrong.

But I do see why some people would do it, if it works then it works.

That being said, I'm not aware of any reasons why this would change a specific device from suddenly hogging too much bandwidth and interfering with others. That's a QOS issue.

I will disable the PF rules - thanks for that! May well have been the issue as both Xbox consoles use the same ports and you can't assign the same ports to be forwarded for 2 different consoles.

I need to find some way to monitor what's going on in realtime if this happens again.

Why Netgear have yet to implement a QOS and device/bandwidth management option on the Orbi is just bewildering. 
We should start a petition, if anything people going through forums trying to decide on a new mesh type device (Orbi isn't really mesh) may stumble across this and go buy something else. Had I know, I likely wouldn't have had the Orbi on my shortlist.

Only way to make a company do something is to impact their profits/public reputation and perception of quality or lawsuits.

Sad, but the only thing that makes them do anything quickly is money, as in losing it or the risk of losing it.