I have a mesh of 3 m9, has been working fine for months now.  Today devices won't work with the internet.  The light on all three devices is green, and the app is communicating with all three devices.  It will even do a speed test.  I connected an old router to the internet source and the internet is there.  I unplugged everything and reconnected, green light is there and the app sees the devices, the internet just doesn't work, including tv streaming, phones, etc.