I've been burning fine for months with +rw and +r discs and it was working great. However, for the past few days it will only burn successfully with +rw discs. Sometimes it takes a few tries with those or they are coasters too. I changed the write speed, quality level,reinstalled the software, updated the firmware and I still get coasters with +r discs. I don't get any errors, they just won't play. The bottom of the disc looks like a normal burn. D'OH! Any ideas?