"Can't connect to Circle" / "Not connected to Circle!"

Circle's been running FINE for weeks. All of a sudden  starting a couple of weeks ago - it doesn't work - can't connect from either my Yoga tablet or my Samsung Galaxy S8 (both Android, neither's updated their OS recently, I've not updated the Netgear firmware recently either). I haven't changed a THING. Have tried rebooting the Nighthawk X6 R8000 (yes, including unplugging it for a full minute). Have fully disabled Parental Controls and then re-enabling it. I've uninstalled and re-installed the app on the tablet, no success. I see other people've had this problem but don't see a solution (yet) in searching through it. I do NOT understand why "RECONNECT" is so useless. (I'd also like a refund of a month of fees! :-)).