acarroll

I have owned a Denon DMD-1000 minidisc recorder/player for some time. I regularly clean it with a MD cleaner. Recently, some of the disc that I have pre-recorded on some time ago have begun to skip, pause, etc. Is this normal - a function of the disc, or maybe the player - and what can be done about it ? While some disc play fine, there are certain ones which skip toward the end of the disc. Most of the disc are either Sony or Memorex, and there seems to be no difference in which name is being played. The problem occurs on either name, and it only occurs on some disc and not at the same time each time (ex: at 58:00 in on the disc). Any sugggestions/advice ? Thanks in advance.