This is not a bug, the issue is software corruption on the original machine the clone was created from and then carried to all machines via the clone.
As Karl says the Forced Altboot with NO_DATA_BACKUP and no clone used will resolve this issue.
I recommend installing the connectkey 1.5 software as well. For the 7830/35 072.010.104.14800 for the 7845/55 072.040.104.14800 for the 7845/55 XOM 072.080.104.14800.
If this does not resolve the issue pleae provide the serial number, contact information and a current configuration report for the printers as the issue would need to be escalated to Discovery.
regards,
James