IPhone gets very hot when not being used!

Been having some trouble with my iPhone recently. For some reason the iPhone gets hot - I don't mean warm... When it's in my pocket I can feel the heat being generated, or sometimes I'll pick it up from my desk and it'll be warmer than me, even when it's not being used.
It's started doing this recently. I've already had to hard reset it due to other issues but in addition to the heat issue the battery goes down really quickly, again when it's not being used. Today from a full charge it was down to 50% in about 2 hours.
I had suspicions it was due to a recently installed app, but I'm not sure.
Any ideas? Does it sound like hardware or software to you? Is there an app I can use to see what app is being used the most (in terms of CPU/memory/battery usage)?

Thanks both. I've restored the device and I'll see how that goes. In addition I've turned off Bluetooth since it doesn't work properly (the reason for doing the first reset). I'm finding if my headset goes out of range of the iPhone, it disconnects and never reconnects to the iPhone. If the headset is out of range for too long and I try reconnecting it via the BT menu option by selecting the headset, it tries to find it but fails. I end up having to completely re-pair the headset all over again.
Any reason for this or is it a known issue with the bluetooth?

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    com.apple.kext.AMDFramebuffer          8.0.0
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    com.apple.driver.AirPort.Atheros40          600.70.23
    com.apple.driver.AppleAHCIPort          2.4.1
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    com.apple.iokit.IOFireWireIP          2.2.5
    com.apple.iokit.AppleBluetoothHCIControllerUSBTransport          4.0.9f33
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    com.apple.driver.AppleGraphicsControl          3.2.11
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