Phone switch off n restart abruptly

Hi,
My phone has couple of problems
1. When I put for charging by turning it on, after a while say 15 min it stops charging n hangs but led indicator would be glowing, I have to restart the phone by holding power n volume up button.
2. If I keep phone idle for more than 30 min, it switches off automatically.
3. Some times it restart automatically
During all these above scenarios phone back would be heated so much. I think bcoz of this heating issue, it's switches off.
I have tired repairing it through Pc companion but of no use.
Please let me know what to do. It's just 2 weeks old phone. Can I go for replacement?
Regards,
Balakrishna

It hadn't crashed but I decided to run a software repair through PCC utility for good measure.When I set it up again I updated everything (including "Video") except the "What's New" app.And I disabled automatic updates in every place where apps update themselves. It went from crashing 2 or 3 times per hour to crashing just once in 4 hours, after I uninstalled the update for "What's New".The last time it crashed was before the "Xperia Lounge" app updated earlier, about 6 hours ago. Then I did the software repair in PCC.My guess is it could have been either or both of those apps causing the crashes. If it crashes again I'll be stumped as to what it could be. Like I said, it hasn't crashed since 6 hours ago. I'll report back if it crashes again.If I don't post in this thread again it means my problem has been solved.

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