Check Coolant light showing after winterizing and coolant already topped off.

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Check coolant light has been on for a while. Jiffy Lube said the sensors can be sensitive on my car model. Just had oil change recently, fluids topped off. 2 days ago in the morning my car was chugging and then I filled the gas and it was better. Today my car almost broke down on the parkway - made it to a mechanic, he said the coolant was low so he topped it off and then it rode better for a while. Took it to another mechanic more local since he mentioned the car should be winterized. Just had the antifreeze changed for 50 bucks, now a few hours later the check coolant light is on the dashboard again. So frustrated, any suggestions, please help. Thanks.