Why won't Blu ray player play some Blu ray movies?

panasonic bd87 locks on movies (what expect when expecting one). movie loads ok, previews play ok. feature startup screen loads ok. when push play player locks up. have unplug reset. every time on movies. - if feature startup screen, go scenes , start scene 1 works. it's done number of movies i've rented blockbuster. blu ray movies play fine. non-blu ray movies play fine. i've got latest firmware, did reset - same problem movies.
called panasonic , response models won't play movies. watch different movie.

know why?

panasonic bd87 locks on movies (what expect when expecting one). movie loads ok, previews play ok. feature startup screen loads ok. when push play player locks up. have unplug reset. every time on movies. - if feature startup screen, go scenes and...

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