Hi all, when I play a DVD movie and the battery gets to the point it's dead, the movie just freezes, remote is inop, and I have to power off using the big silver switch (mbp running latest leopard). Is that what it's supposed to do? If I am just working, and the battery gets low i get a warning and then a few minutes later, the box gracefully goes to sleep until the power adapter is hot again. Well, thanks for any tips!