I spent an hour cursing at my laptop, resetting the wifi driver because it wouldn't stay connected, Phone, tablet TV were all connected fine. I did not even think about the fact that laptop was on 2.4 and not 5Ghz. Then I got the notification that heating system was offline ( also on 2.4 ) and it hit me. I checked the LCD UI and sure enough 2.4 was off. At first I tried disabling and the enabling 2.4 via the LAN UI without success. It took 2 power cycles, but 2.4 finally came back up and everything is happy again.