Welcome to the forums Dave3678.
There are only certain types of DVD media that we recommend. The easiest to find locally used to be Verbatim (AZO) discs. Do [B]not[/B] buy the Verbatim Life Series discs, just those that have the AZO designation on the label. But it is getting much more difficult to find them at local shops. Best Buy may still have some.
If you are willing to buy discs online, you can shop at sites like Rima.com, or Supermediastore.com or even Amazon and find good discs. We recommend the Verbatims, and JVC/Taiyo Yuden.
Here is an example at Amazon for the Verbatim 16x DVD -R discs.
And here are the 8x -R JVC/Taiyo Yuden discs at Amazon.
Many brands switch suppliers, with no cosmetic changes visible to the consumer. So the Maxell discs you got the first time may not be the same as the second purchase. The only real way to tell is to examine the manufacturer identification code found on the blank discs. But even then, brands like Maxell, Memorex and Imation (among many others) are not consistent in quality.