Copying dvd's that have several episodes

hi…i have been trying to copy dvds with several episodes on them…for instance tv series dvds like “buffy the vampire slayer” and the first few chapters are ok…but then they all get slow moving and almost come to a stop…am i doing something wrong…or is it imposible to get a good, clear copy from these tv dvds…thanx

Playback problems like that are usually caused by poor media. Try better quality media, check for a firmware upgrade for your burner, and finally try burning at a slower speed.