Transmission jumping, missing or skipping!! On going for 60k miles

What is your question?

Two issues: 1. Skipps/misses . I have noticed this happens mostly when oing about 40 mph. However it does happen at other speeds. Happens every time I drive it. Has been a consent issue for 60k miles. 2. While driving in stop and go traffic, it gets stuck in a low gear. If I turn it off and restart the car it works fine. Happens about once a month In my opinion it has to be a computer or sensor issue due to the fact that it has been going on for 60k miles. If it was mechanical I would think it would have caused more issues or gotten worse. I am tired of paying shops hundreds of dollars to tell me they don't know what it is. And or replacing parts that don't fix the issue. Any help would be apreaciated.