Have you tried different cabling and/or motherboard settings ? Are you overclocking ? Is everything else stable and optimally configured ? If the answer is always NO, probably the drive is developing a weak head. Does the MoBo SMART (if turned on) trigger an alarm ? If no, probably you can live with it, and the errors while burning DVDs are to be found elsewhere (if there were OTHER read errors, you system could crash or hang. If yes, try zero fill the drive i.e. with MHDD or other utility and check again (you'll lose your data).
Still having problems or MoBo triggers an alarm ? Zerofill the drive for privacy and send it back for RMA, and buy another drive. Maybe not Seagate nor WD...

MoBo = motherboard.