Why's my DVD writer playing up?

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Joined: May 17 1999
I normally use Verbatim DVD-R stock and have been doing a slightly late running job that involves making 9 Masters thatrun to pretty close to 2 hours ( some a bit shorter)
 I don't think it's a content issue, as I ran a test on burning another project and one passed, one failed. It seems to be the burner?
 The message is <Unknown Device Error 0x73, 0x3>
 But I've borrowed some DVD+Rs and so far, so good.
any ideas?
atleast if my luck holds, I can bang these out.