This is suspiciously similar to the Chargepoint dual chargers when two cars are connected. On mine, either when the next car is connected and the current tries to step down or when the other car finishes charging and the current tries to step up, occasionally the Clarity will stop charging, even if not fully charged. Maybe this is similar in that the current tried to change, either up or down due to the heat, and the Clarity just said I'm done. The optional Charging SB might help if this is the case....