Camshaft sensors

I have a 2012 Chrysler 200 with the 2.4 that keeps blowing camshaft sensors, usually within 3 weeks of changing. It's gotten to the point that the local parts stores won't let me return them for warranty replacement, saying there's another problem causing them to fail. When I tell repair shops the problem, they won't even look at it. There isn't a Chrysler dealer within a 2 hour drive, and I don't want to pay a tow bill for that distance. Has anyone else had this problem, and what solved it. Thanks in advance for any help you can give.