This heating issue is most likely due to the Index Services process and S-Finder app trying to index the sd card (I'm assuming you're using a microSD card, but the issue may happen on the device storage as well)
It's been widely reported that with the Kit Kat update apparently this process gets "stuck" trying to index pdf files and causes the processor to overheat.
Try (again, assuming you're rooted) greenifying or freezing with TB these and check your results, worked for me.
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06-08-2014 09:04 PM