I have a similar problem. The 5GHz light is on. It actually connects and then drops the 5GHz after about an hour. I don't think its interference because the same thing happens when the extender is...

I have the same extender and the same problem. I've done hard resets on both the extender and the main router. Didn't help. 5GHz even drops out when I plug the extender right next to the router. It...