Weird Problem with DiscJuggler 3.xx

I've only burned one successful game which is Climax Landers in japanese. The game is self booting and would be interesting if I knew japanese

However Im having a weird with discjuggler 3.xxx tower edition..

it keeps telling me at certain times "spin focus or servo error" Does anyone know what this means?

Im using a scsi-2 Smart and (un)Friendly CD-R-8020 (8x write, 20x read)..

So far I've tried to burn:
18 wheeler
SuperRunAbout (self booting)
Test Drive LeMans.

Each game gives me this same error at different points of burning.. I've read this board up and down and cant find anyone else with this same problem