iOS 8.4.1 is getting heated up after successful update. Anyone? Any suggestions or answers please?

I Bought iphone 6 in june 2015 and it was perfectly working fine until i recently updated the software version to iOS 8.4.1 (latest). I don't know whether its a hardware related or software problem. Anybody experiencing the same thing? Or any suggestions or answers please. I m getting bugged day by day