How to fix heating issue of galaxy s4 i9500

Hey ! All . Iam obaid from pakistan . My Galaxy s4 i9500 is runing on Android 4.2.2 . As far as battery drainage issue i dont feel like iam facing it .. But If its about the Abnormal heating issue that seriously sucks! I mean why had i payed that amount if i cant use the sensor,s or wifi or i cant play some heavy games? Whenever i try to search i find out everyone saying to shut sensors off turn wifi of and your phone wont heat up! what the hell . Can anyone tell me is there any wayout if i root my phone and set cpu frequency to minimum near to 250 or 300 Mhz will my ohone stop heating up? as i purchased it Boxed with local 12 months warranty i want to confirm it before rooting it that will it fix the issur or not?

Regard,s