My overdrive shuts off at each stop when motor warms up not cold

What is your question?

Everytime I stop when motor warms up overdrive shuts off...I have to shut car off then turn back on and I will be in overdrive again until I stop the car...

What makes this problem better or worse?

Better when motor cold once warm up overdrive shuts off every stop

How long has your 2003 Toyota Camry had this problem?

Since I bought it...