Over heating and battery drain on iPhone 4 after iOS 7.1 update

I am facing heavy battery drain and overheating after updating my iPhone 4 to IOS 7.1
The battery discharges @ 1% for every minute - when not in use / idle. The handset stays uncomfortably warm. The background app refresh, location services, screen brightness etc have been switched off/kept to the minimum. Though there is significant improvement in responsiveness. There were no battery/overheating  issues with iOS 7.0.6.
Have reset all settings, switched on/off, given a hard boot (power button + home button) but no use.
Suggestions to resolve this are welcome.

This is not a software issue!!!. Yes, it may cause by the software update.. I had the same issue with my Iphone5 after 7.1.. I went crazy .. seeing my battery draining 1% a minute without using it.. and it took more than 7 hours to charge completely. Worst my IPhone was out of warranty cant take it back to Apple to have it fixed.
Things already did -
I changed the battery
Restored the phone
Switched to setting basically nothing
Waited for 7.1.1 to come out and then update the phone
But none of these helped at all
So i rolled the last dice.. took my phone to a local technician (in Philippines). They said none of the above will resolve the issue.
What exactly went wrong was the - USB POWER MANAGEMENT CONTROLLER IC U2 was busted. Once this was replaced my phone worked just fine. in fact I was amazed with the results.
My phone charged 100% from 20% in less than 60 minutes.
Now my battery lasts for more than 15 hours ( i do not use mobile data only Wi-Fi)
So if your phone is out of warranty no harm in getting this part replaced. If within warranty you may get a replacement handset.
Now to what causes this as per the technician " Every update from apple tries to exclude accessories that are not certified, and you do get the pop up that this accessory may not be supported" continue to use the charger will fry the IC U2 .
Hope this Helps goodluck

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