Trouble burning with Clone CD 4.2.0.2

[belveder]

I have just tried burning a cd using Clone CD 4.2.0.2 (freshly installed, first time using Clone, thought I would try something different from Alcohol) and each time it gets to around 21% burn then I get this box coming up saying

"Writing to cd failed, unit attention: power on, reset, or bus device reset occured (6:0 x 29:0 x 00)"

I press ok and the lose the burning, that's 3 in a row now.

Could someone please tell me what is causing this and how to stop it?

Thanks in advance