Has anyone else have a problem with their cars stalling out

What is your question?

On numerous occasions my car has stalled out on me. Once while in the car wash, three times just driving home from the grocery store not going any faster then 50km/h, and just reversing out of my drive way. Took it to the garage and the mechanic can't find anything wrong with my car. He did say there is 20 different codes coming up when it's hooked up to the computer