Are you using category or library mode? Library mode would be what I am referring to when I say folder browsing and is the folder icon on the main screen of the N3. Category would be the one with the musical not icon. Going by your other post above, it sounds like you are using multiple formats of lossless and lossy formats. I recall reading that you will hear a pop between tracks of different formats early on in this thread, but for the life of me I can't find it now. You might try formatting the card in the N3 which will put it to fat32. If you have an album in one format, try listening to it in library mode and see if you still get the pops. Other than what I suggested, wait for Cayin to respond.