Having constant disconnect / reconnect / baboon errors, tried remediation steps

Hi all, hope someone can help. Just got back into D2 via Steam and constantly getting reconnecting to server or trying to contact destiny server and sometimes code baboon and sent back to main menu.

I am on 2.5gb Up/Down FTTP via MTH Networks in the UK. Nobody else in the house. 2ft cat7 to the router. No other issues in any game/service. 0% Packet loss on Cloudflares test. 0 Packet loss on ping -t 8.8.8.8

I have port forwarded 3074,3097 / restarted router / pc.

Kinda at a loss as what to do next? Hopefully my fellow gamers knows the secret sauce?