If you have G7L9 on it, there is at least one good reason for upgrading to G7P9 (which will not touch your warranty):
PIE/PIF testing with L9 is slow and does not give one of those rates (forgot which).
Boot to safe mode, run the G7P9 updater you can get e.g. from the benq.com / Location: US, reboot windows, will tell you you possibly need to reboot for the new hardware (win as usual), so do it and enjoy much better disc quality scans.
Go Retail no earlier than you are SURE everything is okay! In the Recording hw / Benq/Philips Forum you will find more and more examples of ppl whose DW1620 (I guess mostly OEM, but some retails or Philips branded drives as well) died in the first 6-8 weeks or so.