2015 Jeep Trailhawk Transmission

I have a 2015 Jeep Trailhawk and have had multiple issues (bumps, grinds
and groans) with the transmission. I’ve taken it back to the dealership but
since the transmission isn’t doing anything at the time they tell me there is
nothing they can do. The latest incident the car wouldn’t even move and the
transmission light went on along with a warning light telling me to have the
transmission serviced, after a few minutes I finally was able to move the
vehicle.  I had to wait two days before the dealership could look at it and by
the time I got it there the warning lights were all gone and the transmission
is working fine. So again they tell me there is nothing they can do. My
powertrain warranty expires in about two months. What can I do?