Assuming you were riding real easy without using a lot of throttle or high engine speeds, most likely, the temperature sensor is malfunctioning and sending incorrect data to the computer.
If this happened right after startup I would say the problem is with a loose connector.
Because it waited until the oil was hot before it activated it says the sensor is screwed up.
These UCE powered RE's usually run pretty cool and I can't say I've ever heard of the oil getting so hot that it would cause a problem.
The problem should be covered by the warranty so, take the motorcycle to the dealer and ask him to fix the problem.
He'll probably just replace the sending unit and send you on your way.