DVR110 Bad Burns on -R Media

Hi

I have just bought some Verbatim 8x DVD-R,s

Media Code TYG02

Got them from SVP

Now my problem is that if i burn them in Nero 6 (latest) (4GB iso image) in my DVR108 (1.18 Gradius PIO) or LG 4082B (A09) writers 8X and 2x respectivly i then verify them and they are 100% ok

i have tried burning them in a new Pioneer DVR 110 (1.22) at both 4x and 8x and whilst they burn ok they fail the verify with some bad crc checks at about 60-80% through.

What could be my problem ?