BMW Repair: Electrical Issues with my 2000 528I, alternator belt, electrical issues

Question
Recently I was driving on the interstate and my EML/Brake/ABS lights came on.  Then there was a shuttering and it appeared that the instrument panel shut down.  I was at the 147 mile mark of my 320 trip, after I pulled over shut down the car there wasn't any more problems.  The next day I drove approximately 90 miles round trip, when I went to get back on the road about 5 hours later, I had no power in the car.  I jumped it and it was running fine.  My battery is brand new(less than 4 months).  What could be the problem with my car?

Answer
I would take it to an autozone or parts store and have them check the alternator. I had almost the same issue last week with my 94 525I, however, when I went to look at my alternator, I noticed the belt was almost all gone.  There was only about a quarter of an inch left on it.  The alternator tested fine, but the range was up and down, so I bought a new belt and everything was fine.  Might check your alternator belt as well.  Hope this helps.