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I am assuming you are just using the internal memory on the camera and not an SD card? It is possible to turn on 'spanning' to allow the video to switch from internal memory to a memory card if the memory is full. That might account for the 15 second gap if it jumped over to the memory card. Also, if using a memory card, make sure it is a Class 10. I have seen the Class 4 & 6 cards flake out if you are doing AVCHD in a large format as they will not write fast enough and maybe that is why it is splitting the video?

Also, are you using the camera to edit the scenes and burn to the DVD? If so, it splits them into 2GB files. Here is a support doc http://kbsupport.cusa.canon.com/system/ ... E_ID=34228" onclick="window.open(this.href);return false;

My camera will split the video into maximum file sizes depending on the format and resolution being shot. This may be the issue, however, it should overlap the videos so you can easily edit them in the scene editor.

There should be a file size setting in your menu, so see if that is set to the maximum. Just remember that many formats don't like really large file sizes or they tend to corrupt.