I have had my macbook for about 16 months. I haven't had any issues, other than this, and it started happening about 3 months ago. It hasn't been consistent, but it is frustrating. I will be working or doing something and then all of a sudden my battery symbol shows an X in it, but I have life left in the battery. I installed the update but am still having the issue. Anyone else encountered this? Do I need a new battery? There doesn't seem to be anything that makes it happen. At first I had to power down, then it eventually will start up, if I plug in the adapter it works, but if I keep it on battery it will continue to shut down.
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