Voice coming from my phone randomly?

I've had this phone for a few months now [[It's a slider from the straight talk service...]] And randomly I'll hear a voice come from it for no reason. It only lasts for a few seconds before it goes away. But I can tell definitely that it's a voice, usually a woman's, coming from it... I... show more I've had this phone for a few months now [[It's a slider from the straight talk service...]] And randomly I'll hear a voice come from it for no reason. It only lasts for a few seconds before it goes away. But I can tell definitely that it's a voice, usually a woman's, coming from it... I don't get a chance to tell what it is before it goes away again...
Has anyone else had this happen? And knows what causes it?
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