2003 Nissan Altima electrical system problems

On or about jan. 20, 2006 while driving my vehicles' check engine light would come on and then the vehicle would cut off. We took it took it to fontana nissan for repairs. The car was returned to us on jan. 28, 2006. Maybe 2 - 3 hrs. After getting the vehicle, we were driving to l.a. Area and the check engine light came on again. We called the service mgr. At fontana nissan and he said to bring it back and they would look at it on the following mon.

2003 nissan altima 3.5l v6 se - the door locks keep locking repeatedly. Will do this while I am in and out of the car regardless of key fob use. My hazard lights flash each time. This has been ongoing for over a week and has increased in frequency and duration. It is now constant - going on every 3-5 seconds. I had trouble getting my daughter out of the car because the door kept locking on me. I worry about the ability to get out quickly if needed. It brings attention to my car throughout the night.