I'd be looking at the temp senders. ECT is the most critical. If the sensor is failing hot it could be shorted (full hot) to open (-40)
Does it run rich when it happens?
I've spent a bit of time trying to find the wiring diagram without success.
Find one and I can help you. Maybe buy a Haynes manual.
https://haynes.com/en-us/kia/sorento/2003-2013