Can I intergrate I COPY DVDs 2 & DVD43FREE

I have I copy dvds2 and dvd43. I was able to burn like 60 movies without any problems, now I get a burn error every time. I also used dvd shrink 3.2 with nero 6 and got an burn error. With both the disc starts to burn and gets maybe 20% finished then errors. All the ripping, reading, and encoding seems to go fine. I have a sony dvd rw dru-700a burner with dl capabilities and I checked the drive with a sony drive checker and it was ok. I am using verbatim 8x dvd-r media. Can anyone help please?