Owners/service Manual problems of the 2016 Jeep Compass

The car is automatic but stalled as if it were manual. When I come to a sudden stop it would stall out & shut off the engine. Mostly happens at street lights & stop signs. If I accelerate from a stopped position for to merge into traffic or to go at a green light. It jumps as if not being able to catch a gear shift. When brought to the machanic, they didnt notice anything wrong under the hood. This has been happening on a regular basis since I bought the car in 2017. I'm worried it would cause a crash.