Phone turns itself off when calling

Hello,
When someone tries to call me or when I call out, about 50% of the time the phone will say "Mobile Network Not Available" and then it shuts itself off.
Any help?
Thank you.
This is my second Xperia phone...I bought one 2 weeks ago and it seemed to have overheated and then they gave me this one...they both had the same problem with calling...

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"I'd rather be hated for who I am, than loved for who I am not." Kurt Cobain (1967-1994)

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a PhoneApp - app-deac - 3/23 23:25:38
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Will not turn on, will not turn on unless connected to power, or unexpected power off
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Message was edited by: paulcb

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