"unstable connection" when using my External Bluray burner!

I have a Mac Pro Quad (2008)and a Pioneer bdr-205bk in an external caddie.
I have a connection from one of the hidden internal SATA ports mounted as eSATA on the rear of the tower. My bluray burner has two methods of connection - usb and esata.
In both modes the drive works fine, reading and playing films. When I try to burn I get an unstable connection error and the drive stops responding. I have no idea whats going on!
I am trying to burn with Toast v10 - which has bluray support. As I mentioned prior to burning, the drive shows up as expected and all seems well.
I am running OS X 10.5 - latest patch...
Please can someone offer some advice....

I have heard of ppl this error in SL and running old versions of toast...but looks like you don't have either of those issues!
have you tried burning a regular DVD with finder? same results? Do you only get the error when trying to burn bluray in toast?
when I installed my BD i had issues with the drive not responding, if I restarted the drive would work again, then stop responding again after about 5-10 minutes.
To fix that issue I went to sys prefs > energy saver > and unchecked put hard disk(s) to sleep when possible.

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