Xperia z2 1080p video Playback laggy issue???

Hi everyone i have an issue about Xperia z2 i have a Lot of Videos movies 1080p 2 gb mp4 format when i play in movies app or bs player or mx player videos are laggy fps is normal not slow but frame is jumping lag my firmware stock. 167 but I downgraded. 69 version videos are normally not laggy perfectly normal played... I played in bsplayer with software decoding my movies works fine but my phone get warmer I played with hw decoding it's laggy again I don't understand 69 firmware just fine why?? And I played my movies in Samsung Galaxy s 3 and in pc it's works fine my videos are not have a problem so how can I fix this issue??? Thank you :crying::crying::crying: Sorry my bad English

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