My MacBook Pro randomly shuts down on me. This happens whether it is charged/plugged in or running off the battery. I took it into an Apple store a few days ago and they said that all the diagnostics were good, but they would watch it for a few days and let me know if they find anything. They told me they found nothing and that it never shut down on them. I picked it up a few hours ago from the Apple store and it has already shut down on me once, I was just browsing the internet. I am pretty upset. My Apple Care Plan ends in a little over 3 months and I am worried the problem will persist/get worse and I will end up with a dead laptop. Any suggestions?! EDIT: I recently bought a new power cord because the other one melted, but the problem was occuring before the new power cord and is continuing with the new power cord. Also, the battery is fairly new (less than a year old), so I doubt it is a battery problem, especially since it happens even when the laptop is plugged in.