I would assume by the limited information you have provided that your problem is related to a DVD media problem. Your problem might be corrected by burning your DVDs at a slower speed.
I would suggest visiting the VideoHelp Web Site and check their DVD Media List located at (http://www.videohelp.com/dvdmedia) for the particular DVD media you are using and see if this acceptable DVD media. There is a lot of substandard cheap DVD media being sold these days.
I would also ensure that you have the latest firmware installed on your DVD Burner. You can use a software utility similar to DVDInfo Pro (http://www.dvdinfopro.com/) to determine the firmware version installed on your DVD Burner.
For information concerning your DVD burner firmware visit the Recording Hardware Forum at CD Freaks located at (http://club.cdfreaks.com/forumdisplay.php?f=61). The folks at the CD Freaks Hardware Forum are very knowledgeable and have developed various firmwares that optimize the full potential of your DVD burner.