IPhone become hot and the battery drop

Hi All,
My iPhone is having problem. My iPhone is 3Gs, 32 GB, OS 4.2
My problem is: the phone suddenly become hot and make the battery drop, and it's already happened for 1,5 weeks. It seems my iPhone is reading something (perhaps some application) but I don't know what.
Can someone help me?

There is some application that is stuck trying to send data. The most common app to have this problem is email, but first try a full reset (if you haven't already: Hold the HOME and SLEEP buttons until an Apple logo appears, ignoring "Slide to power off",
If this doesn't fix it next try the following:
Go into Settings/Mail,Contacts,Calendar. Tap each email account that uses PUSH and turn it off (turn off the ACCOUNT, not PUSH). Close Settings and open the email account; verify that the account does not appear. Then exit Mail to the Home screen and do a reset again.
Once the phone comes back on go into Settings and turn the email accounts back on. Fully charge the phone and test it again.
If you still have a problem you may have to restore the phone. Connect to iTunes and click the Restore button. If you have previously restored or updated and that did not fix it this time set up as a new phone.

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http://support.apple.com/kb/HT5262
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Thank you for providing the details about the issue you are experiencing with your iPhone. I found a couple of resources that may help address this issue.
First, I recommend following these steps if your iPhone has a short battery life:
Battery life seems short
Click ( www.apple.com/batteries/iphone.html) for tips on how to prolong iPhone's battery life.
Try turning iPhone off and then on again.
Connect iPhone to iTunes and restore iPhone.
If the screen shows a low-battery image, the battery is low on power and needs to charge for up to ten minutes before you can use it.
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Note: When charging using a computer, don't connect iPhone to a keyboard. Also, the computer must be turned on and not in sleep or standby mode. If iPhone is connected to a computer that's not turned on or is in sleep or standby mode, the iPhone battery may drain.
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http://support.apple.com/kb/TS2802
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http://support.apple.com/kb/HT2101
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The device stops charging.
The display dims or goes black.
If the temperature continues to be a concern, you can isolate the issue by restoring your iPhone as new:
iTunes: Restoring iOS software
http://support.apple.com/kb/HT1414
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IPhone become hot and the battery drop

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