problems with the movie library - Plex

For problems with the movie librarie and the Plex i found out that i got some trouble with playing movies, TV shows and other media works fine its only my movie library.
when i want to watch a movie its takes about +/- 10 minutes to play the movie, when its loaded it work fine (can skip forwards/backward/pause)
When start a movie with PlexWeb its start must faster, OpenPHT/rasplex, Plex for Android (the original one from the Playstore) says loading, but thats all, cant cancel it (it hangs, but cant here sound when pressing keys.)

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