My RE450 is connected to both 2.4Ghz and 5Ghz networks. 2.4Ghz works fine. The 5Ghz conncetion works fine wired but doesn't have internet when I connect wirelessy. My devices will connect to it but they'll say "no internet connection"

I've updated the firmware. Resetting the extender fixes the issue for 20 minutes or so before it happens again. It happens on all of my devices including a Mac, Windows Laptop, iPhone, iPad, and Android phone.

Is there a fix for this? I'm at my wits end as my 2.4Ghz network is very slow and I prefer 5Ghz.