Some videos won't play on iphone?

I have an iPhone 5c and a recent problem is when i try to play videos. Often when i press "play" i get the play symbol with a line through it, similar to the no smoking sign. Although some videos will work normally

Double click your home button, then swipe up the app you were recently on trying to play the videos. That will close the app process. Open the same app again, and it should work again.

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