My phone switches itself off

hi,
my CURVE 8520 switches itself off, without warning, even in conversation.
I have already replaced the SIM card but the problem persists.
My phone is still under warranty (purchased in March 2010), what should I do?
Do you know where the problem may come (battery?) and how I can solve it?
thank you in advance for your help

I recommend you go the warranty route.  It could be the battery, but could just as easily be the device.  This has happened to me before and had to get my phone replaced.
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