Burned dvd

My burned dvds will play out on my pc but not on my stand alone dvd player. I burn using a sony dvd±rw dw-q58a and the meadia i have tried to use are verbatim dvd-r 16x and ridata dvd-r 16x. i have use dvd flick to conver and imgburn and nero7 to burn at 4x speed but the movies play 1/2 or 3/4 through then pause and start from the begining