Problems with Blurays disc
 

I am using Sony Architect to burn BD (mpeg 25MB files); my customers and I have problems playing them; I upgraded firmware in my Samsumg Bd P1400 (I know it is not a newest model but firware is from 09'2009 so it supposed be up to date. The disc will freeze and stop playing after 50% of the content is reached; it is scary... what seems to be the problem????