Looking at my Mesh network, everything looks good - but then, this pesky "you might" . . Tried changing the router/modem Ethernet cable (that's the only one :-)) to the one that comes with the M5 - no

My mesh includes three (3) older M5s. and one new, just purchased from Amazon. Checking my network with Network Signal Info Pro app, the older M5's show the manufacturer as "TP-Link Tech Co, Ltd", whi