Other Fuel System Tank Assembly problems of the 2009 Jeep Grand Cherokee

Twice within the past month, my 2009 Jeep Grand Cherokee with approximately 85,000 miles has stalled on me while driving. Both times I took it to a garage; the second time I took it to a Jeep dealer/service center. No codes were thrown either time and neither service person was able to duplicate the problem. It may be a coincidence, but both times this happened, I had filled my tank with gas that day. On both instances, I was able to put the car in park and restart the car with no issues. Additionally, for the past few months, the car often does not start on the first try. It will start with no problems on the second attempt. Dealership has replaced the win module; this did not seem to help. The throttle bottle was also replaced in case that was causing the stalling; that did not help either. I now feel as if I am risking my life and my kids' lives every time I step into the car and take it on the highway. If this stalling issue happens on a highway, we could be killed in an instant. Very dangerous and the service people don't seem all that concerned. . . They can't pinpoint the issue so they charge me $100+ and send me on my way.