It sounds like the total bitrate of video and all audio tracks combined are exceding the 9.8Mbps DVD limit. PC's don't have this limit, but stand-alone players do. When it is exceded, even momentarily, the audio and/or video will skip or freeze.
Fav quote - "Experience is whatcha don't get 'till ya don't need it no more."
System - Athlon 1.4GHz, Win98, Hauppauge PVR250 receiver and compressor.
Software -Magix Movie Edit Pro 10, Nero 6 + NeroVision Express, Moho 4.61, PSP 8.1, Bryce, Quicktime 6.52 pro, Goldwave 5, DVD-Lab.
Cameras - Panasonic GS9, Canon ES8400V, Canon EOS D20 and Canon A70