Today, I noticed my Focus acting a little strange. The dashboard's power went out as well as my drivers side power window. I was able to go a few more blocks, pulled into a gas station, and as soon as I pulled in, before I put it into park, the car just completely died and wouldn't start back up again. After getting it jumped, it worked again. I took it to Auto Zone and they said the alternator and the battery was fine. A few hours later I tried driving it again and about a couple miles down the road it started to do it again. It didn't start after I turned it on, jumped it, and it started again. Is it just a problem with the battery and Auto Zone read it wrong or could it be something else?