Update. We had a USB3 to Gig ethernet dongle (left over from the last X1). Plugged that into a USB3 port on the dock. Uses the same driver. Lenovo USB Ethernet #2 device appears in the device list. All good - no fault on notebook sleep. So it seems it's a firmware or hardware issue with the dock's ethernet.
Considering now how to engage with Lenovo over the 40+ hours I spent tracking down this problem with their $300 dock!
Initial signs of network failure didn't exactly point to the PC/dock in question. I didn't get into this in my OP, but first symptoms were a cisco switch going nuts and not getting any receive packets from the router despite all port lights up. It took me a few weeks of elimination of (underfloor) cables and the switch to work back to the X1 and only latterly did symptoms with the fritz start showing. And I was doing all this around my partners home work hours - and she works a lot! The one saving grace is that it wasn't effecting her network connection while working. 😅
Anyway, that's my story. Thanks to everyone who made helpful suggestions. 🙏
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