@Kevin_Z specialist wasn't able to resolve the issue. I mentioned that the only real useful advice would be to save the router logs to the usb drive attached to the router, that was my own suggestion

@Kevin_Z unfortunatetly when I restarted the router the logs clear out because they are only saved in ram....

@Kevin_Z just had a disconnect with the different ethernet cable. The router had a red light and I could not connect via the local LAN. So I had to power cycle it.

@Kevin_Z Thanks. Cable has been changed now. I will monitor the next few weeks.

@Kevin_Z Thanks for getting back to me. 1. BT are my ISP, there is no modem. Only the ISP Optical network terminal which indicates a working internet connection. 2. The firmware that was stable did...

I can't seem to downgrade to Archer AX11000(EU)_V1_210719, I just get an upload error on the build. That is sad because it is the last reliable firmware. Maybe time for me to look at another provider...