I picked up my '08 Wrangler last Saturday. The shop went over it. I then took it to my in laws on Sunday, they checked it out. Everything was ok until I went to turn it over for the 5th or 6th time that day. Nothing happened. My brother in law and I popped the hood, he told me to try it again it fired right up. Battery cables seem in good shape and we checked if they were loose. 2 nights ago got home from work shut it off for aprox. an hour went out and again would not start. I called the dealer as it is still under warranty, told me to bring it in. They ran diagnostics said everything checked out, battery was at 14.6 v no power issues. It started right up today. What would be other possibilities?