@David-TP I have reset the RE450 and it's still the same all lights are blue and 5GHz is available on WiFi but just doesn't connect. Firmware is to the latest. The router is only one band connecting...

My RE450 range extender was working perfectly and then one day the 5GHz won't connect to anything but was working for 2+ years is there anything to do to fix or is it just broke?