Audio To Catch Up With Video????

[brucew6]

I am very new to this (3 days). I put together 5 clips and after the first one plays and it comes to the second one their is no audio for about 15 to 20 seconds, the video is fine. Then the video will stop and the audio will start from the beginning of the clip and when it gets to where the video stopped they start (in the proper place, they catch up with each other) together and continue on fine until the next clip and then it does it again. Win XP Pro. VideoStudio 9.