Tibook DVD Sound problem


Official Bartender
I noticed the other day that I get an occasional, semi-regular drop in sound volume when watching DVD on my TiBook. I've tried different DVDs, and playing in both 9 and X, through both external and built-in speakers and it still happens, which worrying points me towards the DVD drive itself. Anyone else suffered from this? Or can anyone suggest anything a little less scary than a faulty drive?