I had just bought the vehicle and it ran well, then about a week later I went to start it and it was dead. Thought maybe I had just left something on, so I jumped it and it started. Then it kept doing it to me about every week. And each time it would get harder and harder to jump start. It will run awhile afterwards, then randomly will not start up again when I turn it off. We have had mechanic after mechanic check the problem but they cant figure it out. The battery is good, the alternator, the starter. I dont know what else to do.