If you have a coolant low light, you have a sensor in your coolant "overflow" bottle. Check the bottle and make sure your coolant level is proper in the bottle (generally there are markings on the side for hot and cold levels). It sounds like the level is just at the point where it needs a little added.
If the level is fine, I'd get the sensor checked, as it may just be a bad (intermittent) sensor.
Well, top off the overflow tank to the marks as indicated based on engine temperature, and see if it happens again, and note how long it took for it to happen.
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