If you experience any problems with your transmission such as leaks, noises, problems with shifting etc. don't wait until the problem gets worse and then the car finally stops on the highway. Visit your local transmission shop that you trust. Automatic transmission problems never disappear by themselves. Also, when going for the repair, try to explain to the service manager exactly what it does in detail. Like:
What is it exactly that you are experiencing?
Does it do it just in the morning or frequently at night time?
It is easier for them to repair the transmission. Before going to the transmission shop for the repair call them up and ask them about their warranty. The longer the warranty they give you the better the repair.