Writing error DRU 810-A

[qanda]This thread is about the Sony DRU-810A. Click here to see full specs[/qanda]I have had the Sony DRU-810A for several years with no real problems. Lately I have been getting a sector error message at the end of a burn. Convert-x pops up saying it could be caused by a dirty or scratched DVD (no) or it could be a hardware problem. Any advice would be appreciated.

Buy a couple of these and use them every month:

Allsop 23321 Ultra Pro Carbon-Edge DVD and CD-Drive Cleaner