Some Video DVDs have stopped mounting on my OPTIARC Superdrive

I have a Mac Pro 8 core with 10.6.4, and suddenly some (but not all) Video DVDs have stopped mounting with the OPTIARC DVD RW AD-7170A superdrive. After inserting the Video DVD disc, the drives just sort of makes a clicking noise, and then after a few minutes ejects the disc. Other Video DVDs mount just fine.
Audio CDs, DVDs that have been burned, and other Video DVDs mount and play just fine. The same Video DVDs that now refuse to mount on this Superdrive, mount and play just fine on my other Super Drive equipped Mac's. I am pretty sure the DVDs are not faulty and that all are the correct region.
Any ideas are appreciated.

Hi Gary,
I am seeing a very similar problem with the drive sporadically reading/not reading any dvd, and only sporadically successfully burning a dvd.
From what I have read so far, it seems that the drive is just faulty. There may be a firmware upgrade available here: http://liggydee.cdfreaks.com/page/en/Optiarc-AD-7170A/
That said, I'm not sure how to flash the drive yet, and there is a risk in doing so.
My details:
OPTIARC DVD RW AD-7170A:
Firmware Revision: 1.NC
Interconnect: ATAPI
Burn Support: Yes (Apple Shipping Drive)
Cache: 2048 KB
Reads DVD: Yes
CD-Write: -R, -RW
DVD-Write: -R, -R DL, -RW, +R, +R DL, +RW
Write Strategies: CD-TAO, CD-SAO, CD-Raw, DVD-DAO
Will post again if I get a result in my investigation...

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