Audio in movie burned to DVD missing or sporadic.

I have converted a movie to Quicktime using MPeG Streamclip; something I have done numerous times. The converted movie plays fine with good audio on my iMac hard drive. I want to simply burn the movie to a DVD (without turning it into a project). But, after burning the movie to a DVD the audio only comes though sporadically and out of sync, AND it seems the DVD does not want to respond to my "control". Meaning, when I hit the stop button the DVD continues to play a bit before stopping. I have burned a number of DVDs with this burner - succesfully I might add - and this is the first I have had this problem. Is it possible the burner is failing or is there another problem I am missing? Thanks!