Cue points sometimes don't work

I built an swf that runs a video using the FLV Playback component. I added the cuepoints using the interface within Flash CS5. Most of the time, the video runs properly, stops at all the right cuepoints, moves to the right cuepoints when my code asks it to, but occasionally, it screws up and the video jumps back to the beginning and sits there at the beginning until the .swf stops playing. The only way I've been able to fix it is to remove the FLV Playback component from the stage, re-import the video, and then add the FLV Playback component from scratch and add all the cuepoints in manually again. Does anyone know why this happens?