So I use Dropbox to get stuff off my i4, like videos and pictures. I upload stuff using the Dropbox app and then download it to my computer. Today I had an issue where I transferred several movies, but when I playback them using any application on my computer (iTunes, VLC, etc.) there is no audio! And it's funny because when I first played the first movie the audio was there for a bit and then dropped out. Thankfully everything is still on my phone and functional as-is, but there has to be something I can do about this! Any help is MUCH appreciated.