The "Check Tire Pressure" Message and light comes on. Tire pressure OK> Serious

Does it come on when first driving , then go off after a few miles on the road? It may just be temp. changes and pressure right at threshold for sensors. Driving warms up tires (10 degrees = 1 PSI). If low pressure limit is 27PSI and tires are set to 30PSI in the afternoon after driving a few miles (like to a station to put air in them) and it's 70 degrees out , and you go home , park it and come out the next morning and overnight temp. dropped enough, pressure at start-up could be just below limit causing the light to come on until warmed up a little. Hope this made sense.