Owners/service Manual problems of the 2012 Jeep Patriot

While on the interstate, I was in the fast lane attempting to pass another vehicle when I started to hear this strange noise and I began to lose acceleration and the transmission light with the circle around it came on. It was a very scary thing because I had a car behind me that was very close. I was able to pull over to the shoulder. I pulled out my owners manual to see what was going on. I followed the instructions by putting it in neutral and idling it for a few minutes. It eventually stopped making that noise and the light went out and I started out on my way again. I still had a 2 hour drive left on my trip and I was scared it would happen again before I could get home. I took it to my local Jeep dealership this morning and basically was told there were no sensors lighting up and they couldn't fix the problem if they couldn't replicate it. So I'm left with a car that I can't trust.