Try a CD/DVD lens cleaner and if it still is picky start shopping for a new drive. From what I can tell, the drive is 3 to some years old and that's about right till you see issues.
I have a Toshiba SD-M1052 DVD drive and use real/Win DVD 4 to play my DVDs. Recently the drive has been really picky about which DVDs it will play. It will play only the special features side of bowling for columbine, will not play girl with a pearl earring, but will play standing in the shadows of Motown fine. All of the DVDs mentioned work fine in my friend?s laptop? Any suggestions?