Photon worked before but now blinking green? Do not panic

I have three photons which worked fine before. On a gloomy Monday morning I noticed that the one that was online and formerly working was now blinking green. Checking one by one, I saw that all three were blinking green and not breathing cyan as before.

Searched the forum - no joy.
Power cycled the WiFi router - joy!! - times three!!

I will leave it up to the gurus to explain this…

@butchalline, doesn’t that kind of say it all? If your router went into a stupid mode (like stopped handing out DHCP addresses or accepting connections) then the Photons would lose wifi connection at the end of their DHCP lease and not be able to get a new one. Of course, no wifi means blinking green.