A battery pull is used occasionally when their is a system issue (memory, or just acting weird). If you're having memory issues on your 9000, you should look at closing some of your running applications, removing from the device some applications that you really don't use, getting a SD card and moving your pictures, movies, music to the SD card.
You can also use the memory cleaning function found in Options|Security Options|Memory Cleaning to clear up some memory.
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