Why is my transmission slipping when it gets hot?.

What is your question?

My 2000 Nissan Maxima 3.8 ltr transmission slips when it get hot what causes this problem and how can I fix it? It happens mostly when there is alot of stop and go traffic. I check the transmission fluid every time I drive it and the fluid isn't low. Can you please help solve this problem? Thank you in advance.

What makes this problem better or worse?

It gets better when I shut off the car and cools down

How long has your 2000 Nissan Maxima had this problem?

About 5 years