I've had this Archer (A9) AC1900 plugged in and working fine for 3 days solid. No issues. Out of the blue, my 2.4 & 5GHz SSIDs disappear. No connectivity on LAN. No default Gateway when I checked my...

This same exact thing just happened to my Archer A9 that was in use for all of 3 days. I have green 2.4GHz, orange WAN, and green WPS lights on and solid from the moment I power it on