Weird Apple Bug, or Strange Coincidence?

So I have burned hundreds of DVDs without a single one failing – which isn't supposed to happen, from what I've read.

Then, today, twice I told it to burn by typing Command-b instead of clicking "Burn." Both times the burn failed 5 minutes into the 15 minute burn, with a visible messup (a stripe like the space between songs on a vinyl record).

Does the DVD burner actually care whether I use a keyword shortcut or use the GUI (graphical user interface).

UPDATE: No, now we've had one fail clicking the GUI. So, strange coincidence: overextended computer, bad batch of DVDs, or an external DVD drive nearing the end of its useful existence? Agaric Design wants to know– and so does The Fund for Authentic Journalism.