I have a 2015 F3 S with almost 5000 miles. On the way home from church Sunday it overheated. The readout scrolling across the screen and the temp going up. Thank goodness I was right in front of an auto part store and it was low on antifreeze. I bought some, filled up and was good to go. I filled it up and drove it about 120 miles with no problems. Seems odd that it would be low. There is no signs of leakage where it is parked etc. Any ideas. Does this sound like a trip to the dealer to find out why?