general problems of the 2001 Jeep Laredo

My 2001 Jeep grand cherokee Laredo has been shutting off while I am driving and also sometimes it doesn't start properly. My mechanic doesn't know what is wrong with it. This is the second time he is looking at it. This has been going on for approximately three months. What really concerns me though is that it is just shutting off while I am driving. This defect may cause a serious accident while I am in traffic. I am scared to drive it cause it is happening everytime I drive it now. I did find out on the internet that there are other complaints out there and that the problem might be the front control module. I have called Chrysler to find out if that is really the problem. No one knows anything about this complaint at Chrysler. I just want answers so that I can get it fixed. I am really worried that I will be in an accident.