Sony DW-D22A write errors

I purchased the Sony DW-D22A DVD burner a couple months ago. I had burned some videos and things to a few DVD+Rs and DVD+RWs and they appeared to burn successfully. Recently though I noticed while trying to open or copy some files from one of the DVDs that I burned, that I always get cyclic redundancy data errors when copying the files. I did some more tests and found that all I get these errors on all DVDs that I write to, even if I write a small file. Is this a problem with the burner or a problem with the DVD media I am writing to? Does anyone have this burner and ever have any problems like this with it? Thanks!