Why does my movie keep pausing every 5 seconds?

I downloaded and put the movie, The Hunger Games, into my iPhone 4.It required 4.6 GB of space and I deleted a bunch of photos and useless apps that I don't use in order to add the movie. I gave it the exact amount of space, now it's finally downloaded into my phone and it keeps pausing? I don't if it's supposed to do this but I'm getting really frustrated.

If you have the option to lower the resolution, that should stop the pausing.

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