User already logged in (when not) on hub

Recently, when I want to configure my hub 3.0 for port forwarding etc, I get this when I try to log in. No one is logged in, I even made sure to log out of my last session, but it still does this:
"Please Note!
Someone else is currently logged into the settings page. Only one session at a time is allowed. Please try again later."

I've had to reboot my hub 3.0 with the pin button to fix this, only for it to come back when I try to log in the second time, unplugging the hub 3.0 from power doesn't make a difference (I had it disconnected for 10/15 minutes and it still didn't work afterwards).