Hello all- I have a Pioneer DV-525. I purchased it right after they came out (3 or so years ago). I've noticed in the last few discs I've watched a lot of artifacts (jaggies), etc. Do average DVD players have a shelf life? How do you know if one is going bad or if you've just encountered a few bad discs in a row? (by the way, the dvd's are: Zoolander, The Others, 2nd disc of A Beautiful Mind). Thanks.