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Question: VE465 locks up and can't be used

Every now and then my VE465 locks up on its own, and I cannot do anything with it. Nothing works. I can't phone out, I can't shut it off, no buttons work period. The only way I have been able to do anything is to pull the battery, replace it, and then the phone works.
What is wrong? What can I do to get the phone to work without pulling the battery? If I had an emergency, I would be s**t out of luck.