general problems of the 2008 Saturn Vue Hybrid

My 2008 Saturn Vue Hybrid started having huge problems. First the air conditioner started blowing hot air then the stabilitytrak and service hybrid system; loss power warning came on along with the check engine light. My 2008 Saturn Vue Hybrid would power down to 50% before engine shuts down. Sometimes it restarts then shuts down again. It did this off and on for about a few weeks. Sometimes vehicle refused to start and when I attempted to turn key it seemed like was stuck inside making it hard to turn or remove it. The mechanic replaced the battery and even hybrid battery and it was fine for some time. However today 10/14/14 in the middle lane of brooklyn queens expressway (busy highway) in new york city the automobile started to stall at 45 mph and the stabilitytrak and service hybrid system, loss power warning came on along with the check engine light then suddenly engine shut down. Fortunately no accident occurred and cars behind me were able to maneuver while I was able to drift over to curbside. Can you imagine if my car stalled at the crossroads? I was having my wife and 5 years old child in the car traveling with me. They started to have a panic attack because it seemed we are going to crash and die. I called towing company to tow us to safety. I'm scared to drive this car since. Please help and assist to push gm to take responsibility and recall the issue in order to avoid more serious casualties.