Problem with STORDIGITAL CK-PRO 1-7 16x DVD HD (CD DVD DUPLICATOR)

We are experiencing a major problem with our new STORDIGITAL CK-PRO 1-7 16x DVD HD (CD DVD DUPLICATOR). The duplicator is a 'stand alone' appliance. When we create our own in-house master DVDs from our Avid/Sonic editing DVD software - and we try to burn copies from the master using the stordigital duplicator - an error message always appears approx 40% into the writing process. The error message reads 'Source Drive Read Disc Error'. However, when we burn the same master DVD using Nero on one of our office's PCs, there is never a problem. We have tried reducing the Stordigital's burn speed and copying onto the harddrive, but this does not make any differnce. The duplicator works fine when we burn other master DVDs that have not been created on our Avid/Sonic System. We can send you copies of the masters in question as we believe there is not a problem with them...especially as we can burn copies from them using other applications. PLease advise urgently. Nick Straker Tel: 02086052012 (England)