Monday, January 07, 2019 5:17 AM
[...]

quoted

This is probably an xHC bug. A similar issue is fixed by commit 9da5a1092b13
("xhci: Bad Ethernet performance plugged in ASM1042A host”). 

quoted

I just got that exact message above, with the r8152 in my 1-day old WD15 dock,
with the TB16 "workaround" enabled in Linux kernel 4.20.0.

Is the xHC WD15 connected an ASMedia one?

I don't know.  I *think* it identifies as a DSL6340 (see below).

According to our record, it is relative to the asmedia.

Best Regards,
Hayes