I'm hoping there is an easy fix for this, so if anyone knows it, your assistance will be very appreciated.

I can download music and small video files just fine. When I try to download large video files (around 500 MB and up) it just says connecting for a long time and then it says "Needs More Sources". I tried many different video files and many different formats (.mp4, .mpg, .avi). Does anyone know why I am only getting this problem when I try to download large video files?