Some movies have a tendency to freeze when I stream them from a network drive. It happens always in the same place in the movie which I would guess means that there probably are some errors in the movie files. But when I copy the same movie file to an USB stick I can watch it problem free. I don´t either have freezing problems when I stream the same movies with a PC using VLC.
Is this just a bug in the firmware or could this be caused by something else? Are there any methods / programs which could be used for checking the movie files (and possibly correct the errors?)

I am using BDP7500b2/12 and have 1.53 firmware