movie videos getting stuck before end in my new lumia 730

[WPCentral Question]

movie videos in my phone lumia 730 not playing properly , it gets stuck atleast 20 mints before end of video. even after formating memory card (32gb class10 samsung evo), soft reset,and then even after factory reset problem still occuring. some movie files takes a long time for loading and not playing smoothly but the same video works smooth in lumia 630. i dont know how to solve it, please post your answers.