EX3800 - 5Ghz band "secured, no internet"

Hi,

For no apparent reason at all, my 5ghz band is not working. My 2.4 band works totally fine, and both of the bands are working on my router just fine. The 5ghz band on the extender will be visible and will connect to the computer, but wont connect to the internet, saying (secured, no internet). On android, its simply wont connect to the 5ghz band at all. I have tried factory resetting multiple times, the firmwares fully updated and no issues show up on the extender portal, where it says everything is connected just fine.

Any help would be appreciated,

Thanks