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I have an HTC Desire Z which I have bought 3 months ago and I usually use it for phone calls. I don't have many apps in it. Sometimes when I call from my phone it switches off and then I have to remove and reinsert the battery to restart it.
What could be going wrong here? I have Android version 2.2 on my phone.

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Sounds like a kernel panic. –  Matthew Read May 1 '11 at 17:33
    
Wats the solution? –  user4125 May 1 '11 at 17:34
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Hacker solution: Root it and flash a new kernel. Mainstream consumer solution: Restore to factory settings and see if that helps, or go to your wireless carrier store and have them flash your phone. –  kchau May 2 '11 at 11:48
    
@kchau Feel free to post that as an answer. –  Matthew Read May 2 '11 at 12:54
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2 Answers

Hacker solution: Root it and flash a new kernel.

Mainstream consumer solution: Restore to factory settings and see if that helps, or go to your wireless carrier store and have them flash your phone.

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Install Battery Monitor Widget, and the companion app Process Monitor Widget.

These will display and log the battery temperature and CPU usage respectively. Process Monitor will also let you see a list of the most active processes.

This may help you learn what's happening on the phone before you go as far as restoring factory settings or flashing.

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