Hey guys I have an iPhone 4 4.2.1 with a greenp0is0n jailbreak. Lately I've been having issues playing back video. This happens with YouTube, recorded videos, and mms videos as well. From time to time as I attempt to watch a video the playback functions will appear on the screen and even get sound but no video. All I get is a black screen. In order to jumpstart video I have to record a new video and play it. At that point every other video works again....for a while. A day later or even a few days later it acts up again. Anyone know what the cause of this is??