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Hi nessa_10
>you can try this might work
settings -> apps -> all -> youtube -> celar cache/data and disable the youtube if possible, restart the phone and try it again
Manjuboyz 
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You can also try to clear data for movies under settings > apps > all > movies > clear data.
Restart your phone and try again.
If the behavior still persists, do you get any error message when trying to play the videos?
Ok. That sounds quite strange. Does it work if you are connected to a Wi-Fi network?