Just don’t touch it for a couple of days and then see if it clears up. Mine did. Have you tried to do a soft reset? I did and then let it sit. 
Everything is working today, but still cannot add a sensor or change the Tune Setting.
To do a reboot / Soft reset: Unplug the power and then press the button until the lights go out or change. Then plug the power back in. You should see the lights be solid and then cycle. When done it will be solid. Do not panic if it keeps cycling, that is what happened to me. after about 24 hours or so everything started to work again.
Did not lose any connected sensors.