i've had a MZ-N505 for a years and now i now notice a lot of playback disruption the songs are lp4, but this is the first time i've had this problem. i tried switching disc but it didn't help(note: i have not gotten a new md in years but have re-used the ones i have about two or three times for each disc).i thought it was the player's problem at first but the disruptions happen at the same points in the songs. So, what usually messes up first the player or the disc so i can know which to replace? Update: the discs were the problem they weren't even made by sony but memorex so i switched back to my even older sony discs with no disruprions at all