Sorr
Sorry for the late reply.
Thank you for posting that..
This is a new motherboard, and I only just realised that 4 NIC's were enabled in the Windows settings. Ethernet, Wi-Fi 2, Wi-Fi 5 and Wi-Fi 6.
I disabled the 3 Wi-Fi NIC's, as I don't use them. Only NIC1 shows - my Ethernet - and no more issues!