unable to play on PS3

I keep getting a “there was a problem playing this item” when trying to watch a movie on my PS3. The error message either states that the video didn’t start playing on time…or…unable to locate source. even though im able to see the movies that are on my server it just doesn’t seem to play any of them. is there a new update from 3 weeks ago from when i installed the app? What can I do