Do you mean self-printed stickers that you put on the burns? Because problems with those stickers can actually pull the data off the CD itself by drawing the ink straight through the media and out the top. I just avoid using sticky labels on mine for that reason.
I'm not sure how much heat is required to cause problems with these labels, but as touchy as burns tend to be in standard audio CD players to start with, it's best to just skip the label and just write the information on the CD with a marker.
What brand media are you using? I've found that the Office Depot CDs work great... for about 6 months. They burn with fewer flaws than any other off-brand, but then after that they start to just lose media off them, even if kept in storage. Since switching to the Memorex brand, we haven't lost any media, though it's only been about 8 months so far that we've really held stuff on them.
Hope any of this might be helpful to you.