[quote=geno888;1929079]This issue is common also in 1655 drives, but if I’m not wrong there is no firmware able to eliminate it.[/quote] Unfortunately you’re not wrong.
My BenQ DW1655 will scan with only one dip at 137 MB most of the time when scanning at 8x (CAV) but will sometimes dip many times; once in a blue moon it will perform a scan entirely without dips. If I scan the same disc again at the same speed without removing the disc from the drive first, the dip at 137 MB is back.
AFAIK nobody has figured out any way to fix this annoyance with BenQ DW1655/1650 drives.