car suddenly loses power then stalls, Hi voltage jump pak needed to start again

What is your question?

B4 buying the car I had it inspected there were no electrical issues I even drove it for 3 days before I made the purchase although it had 166,00miles it felt & looked like it only had 166miles about 4 months later i go to start it & no power. Like I didnt have the fob everything was dead no clicking sounds nothing tried jumping it & it melted my sister's cables as well as cooked my nieghbors little jump pack. Called mechanic he came over said it was alternator he put his jump pack on & stated it put it on flatbed next day I pick it up all good(at least I thought) 3-4days later I was driving put ac on car lost power & died nothing would jump it but heavy duty pack It started he did some quick tests & said it looked good brought it back to mechanic where he said it looked fine long story short im now on 3rd alternator another starter, replaced pcm & bought a 700$ pack No codes it seems to die more on hot days &; in traffic the brake lights & traction control lights come on &dies..

What makes this problem better or worse?

Worse when its hot sitting at a light stall when it turns green

How long has your 2012 Nissan Maxima had this problem?

Couple months runs great 4-5 days then gotta jump it for 2 days straight