That is
quite likely a issue with your drive or the media (or the combination of the two -- your drive doesn't like that media).
If you haven't already, I'd stongly urge you to check with Benq for a firmware update. I've seen certain drives regularly eat media like that before and it's almost always a drive issue (like my absurd Pioneer 109 drive). Sometimes they fix them later with firmware (and sometimes they never do and they just stay bad).
It could also conceivably be just an incompatibility with the particular media type you're using as well, and sometimes this can be solved with firmware (or with using higher-quality media such as Verbatim DataLifePro or Taiyo Yuden media.
Discmakers' Ultra line of blank discs are Taiyo Yuden, and I personally use them with my duplicator at work and they are quite reliable (I use the white Inkjet printable, Waterguard ones, but they're the same disc "inside" as the silver ones).
If you want to go a little cheaper, I've also had good luck with Verbatim and Imation discs. I had more issues with these than the Taiyo Yuden discs I use now, but they were far better than most "store brand" CDs (like Maxell, Memorex, Sony, Panasonic, etc). Those "big" brands are just rebranding whomever gives them the best lot prices on discs. One pack of Memorex discs might not be the same as the exact same "model" of a different pack of Memorex discs. Quality can vary dramatically from vendor to vendor and from pack to pack. Newegg.com sells packs of both brands in reasonable packs at good prices.