As a brief overview, I have a Virgin Hub in modem mode, with an Archer AX10 connected for my router. On wired devices my connection is fine until I use a VPN. In either the case of my works corporate VPN, or something like NordVPN. Once connected to one of these VPNs my connection becomes extremely slow and unreliable, often loosing connection as soon as I try to do anything that might use more than a small amount of bandwidth. If I connect a device straight to the Virgin hub in modem mode, these issues disappear so my assumption is that there must be something on my AX10 incorrectly setup.

I initially had this issue earlier this year and managed to resolve it after changing the DNS settings. However I had to replace the AX10 last week and after restoring the settings to what I believed them to be, the issues have returned.

There is also a secondary issue that on devices connected via WiFi, such as an xbox, the connection is ocasionally lost and trying to reconnect give DNS resolution errors. It was this which led me to changing the DNS settings in the first place that seemed to work, but as I mentioned has had no impact this time around.