Front Air Bag Sensor Control problems of the 2011 Chevrolet Equinox

I got a warning that said service airbags. I brought my car in and they found out it was the passenger air bag. They reset the sensor and it never came back and so they said it was fine. About a week went by and the light came on and then disappeared again. I called and they said they would need it for 3 days and it could cost quite a lot of money. When I read all the reports of others who had seen this signal it seems very similar because it doesn't stay on. I have read that it could be a seat belt trigger or caused by the heat, but I am very concerned as this is certainly something that is a safety concern. My car is also under 60,000 miles and this shouldn't be a concern at this point. Please advise if there has been other issues with this. I am hearing about many myself.