Satellite only connects with 2.4Ghz

This is very strange, I've had my Orbi system for a few months now and it worked fine until 2 days ago. I have the router and 2 satellites, one is wired and one uses the wireless backhaul. The wirelessly connected one has always been on 5G and showing "Good" connection status. 2 days ago we had an internet outage, when I came home internet still did not work, so I power cycled the Arris modem, waited a few minutes, but still no internet. I power cycled the router and the Internet came back. The wired satellite also came back online (i.e. I can access internet from devices connected to it), but the wireless satellite has reconnected on 2.4Ghz and is not moving back to 5Ghz. I have tried power cycling again the router and the satellite, I have tried clicking the "Sync" button and I have also tried moveing the satellite a few feet away from the router. Even 5-6 ft away from the router it still connects in 2.4Ghz. I now placed the satellite back to its original position (where it always worked in 5Ghz), and it's still connecting in 2.4Ghz.

 

I had in the past had to power off and later power back on the Orbi system and it all worked nicely.

 

Is there some suggest path for me to make them reconnect at the highest speed?

 

Please don't suggest factory reset. Thank you ;)