For several months and writing to hundreds of unbranded Ritek DVD-R x4 discs I had 100% success. All discs played on all members of my family and friends standalones without a single problem. A few weeks ago however after opening a new batch of discs it turned out that freezing and pixelation occurs on some standalones and not others. I purchased another batch of Riteks from a different store at the weekend and tried these only to find poor results again. Now either my Sony DRU-500AX is starting to wear down and create weak burns or Ritek are rushing out the discs on the production line to meet demand. It would be interesting to see if anyone else has this problem.