@woozle alas, I had already done this to no avail!

@woozle thanks so much for your reply. I was optimistic but no, same error code: 5656 VLAN ID already exists :(

My internet comes via a Huawei 5G CPE Pro 2 WiFi6 Dual Band Router, using an EE 5G simcard. This drops out on a frequent basis, and I read one reason is that it's a hardware issue common to the...