Default OPO getting hot

My OPO is getting hot when using hangouts video chat and navigation. I could understand if I was playing a resource intensive game but video chat and navigation. Any one else notice this?
Hero > Evo 4G > Nexus S > iPhone 4S > Samsung Galaxy S3 > iPhone 5 > Nexus 4 > HTC One M7 > Samsung Note 3 AT&T > Nexus 5 > OnePlus One
Rom: This one


If I help you please thank me by hitting the thanks... Thanks!