2013 Limited Town and Country Stow and Go

Our van wouldn't start about 6 weeks ago.  We sat there and tried several
times.  The van almost started several times.  Then it started like normal.  
The same day we had the same problem again.  Then the next day.   The
service department couldn't get to us for a month so we took it to another
authorized dealer service department.  $500 later, we were told the computer
showed there was nothing wrong with it.  The batteries in our keys were
changed.  We still have the same problem.  We've had it back to that service
5 times.  We had to drive it out of state, we had the same problem while
there so we took it to an out of state authorized dealer service.  We still have
the same problem.  We've had it in 7 times (5 here and 2 out of state).  The
out of state removed the auto start button and we used the keys instead.  
We're still having the same problem.  Has this happened to anyone else?  If
so, can you pass on the solution.  Thank you.