Hey all. Just checking to see if anyone has ever encountered valve stems failing in succession. One of my rear tires was flat Monday morning. The tire shop said the valve stem was leaking, and they changed it free of charge. This morning a front tire was flat with the same problem. I took the car to the shop again and had them fix the bad one and change out the other two for peace of mind. The tires are only two years old. I never thought I would be doing preventive maintenance on tire valve stems....