Minimserver in Windows Explorer - normal flip-flop or clue?

[Charles7]

Thank you for the weekend reply. Yes, this certainly seems to be a UPnP multicast problem.

But not a problem with the Deco router. I've had it almost ten months, but this problem arose only a few days ago. The equipment and topology of the home network has not changed. Nor did the problem begin right after a router firmware update.