I'm having problem with my MZ-N910. It sometimes keeps relatively loud strange noise. The noise sounds like a resonance and it sounds 1-4s. I think it comes from the servo. It seems that it comes when the servo moves the head fast a longer distance. It does not occur while playing or moving to the next track. The device is fully working; no problems with sound, playing, recording, searching, but the noice is annoying. First I thought there was something wrong with the disc quality, but it happens with all my discs.
The device is very rarely used, almost as new, never dropped etc.