Low Oil Pressure warning on Jeep Cherokee Sport 2015

I dropped my Jeep Cherokee to the dealership to upgrade software. They
asked If I needed oil change but I was good at that point so I said no. Two
days later when I was driving on a highway the Low Oil Pressure warning
came on for few seconds, but  after it cleared. I stopped at the gas station,
got some synthetic oil, added some oil to the oil tank, and continued driving.
The warning didn't came back. I still decided to ask Toyota mechanics to take
a look at it. Did anyone has Low Oil Pressure problem before and how to fix
it? Thank you!