Yes Short answer - my AT&T Fiber Line or Modem was bad. Long Answer - I eventually redid my network and put the Deco's in AP mode and relied on the AT&T modem to act as my DHCP/DNS device. Things...

Over the past 2-3 days, our "Main" Deco M5 would stop working and would display a solid "Red" light where it is normally a solid "Green" and all network functionality stops working (even local...