dvd burner???

i have a benq 60 dvd burner burned about 15 dvds with like 10 audio cd's, now the first 15 dvd's were great i was able to play them on my dvd player and be able to watch them on my t.v., but the recent dvd's that i'd burn, as soon as i'd put in the cd the screen would just go up and down like in a circle and wouldnt be able to see the movie clearly but u can see that there is an image, so i put the new dvd in my laptop, different computer than were it was burnt from, and it plays fine under vcl? any ideas, i also downloaded all the latest firmware and about to install them on my desktop and try burning it again to see the outcome, but in the mean time u guys have any suggested ideas?