When i am writing a text my phone will just freeze then turn off why is this? my phone is the samsung U600.

this type of problem is common in many sets.... please can u briefly tell ur problem... while you are typing text quickly then the phone freezes and then turn off.............. will it turn on automatically after 10-20 seconds??? this type of problem is common in many sets.... please can u briefly tell ur problem... while you are typing text quickly then the phone freezes and then turn off.............. will it turn on automatically after 10-20 seconds???