Android :: Noise During Video Playback

I have noticed that during playback of video I take with my Motorola droid, I hear a sort of a pop every now and then. The first time I heard it, I thought it was something going on around me when taking the video, but it's not, it appears that the sound is coming from the droid, though I do not hear the pop when recording. There is no rhyme or reason to it. Sometimes you don't hear it at all, sometimes it's every 30 seconds, and a lot of times, I hear the pop right at the end of the video, but sometimes it happens right in the middle.