Not a "never before seen issue". Mine did the same thing after 4 days. I took it off the charger, and it would only stay on if it started up with an error like wrong orientation or contact with footpads. There were two cells out of balance, which may have caused a safety shutdown of some kind.
I didn't have it back for very long before cells started going out of balance again, to the point where one keeps going up until it triggers an overcharge error.