what have you tried when using dvdfab in order to copy these discs ??
full disc main movie, clone mode or ripper mode. also what brand of blank discs are you using ??
it might help if you post the dvdfab internal log files.
I usually use Clone but have not had any problems copying entire discs recorded with my Panasonic 850.
I've also recently used RIPPER to extract some programmes from multiple discs to combine into one and also had no problems there either although those recordings were done on my previous model from about 5 years back
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