@kytta I had the same sort of problem with a TPLink VR400 - although in my case a proper power cycle always brought it back.
Nothing in the logs, no obvious network traffic. DSL still worked, but only to/from Ethernet. Ended up writing it off as dodgy hardware.
Hope you have better luck!
@tswsl huh, I have an Archer VR too, but the 600 model. The power cycle does bring it back, yes, but sometimes it goes away almost immediately after that. I gotta investigate, this may actually be a HW/SW issue with the Archers