You must have been using it incorrectly and you'll excuse me for saying, but why on earth would you not watch it until the end before the nozzle passed onto the label? It takes all of 30 seconds to clean a side, to leave makes no sense at all. And even if the nozzle goes on the label for a week and a half it makes no difference as you let that bit of thread go into the waste jar so a new, clean piece of thread is exposed. As for your comment about dulling the sound, that's simply not true. It makes no difference at all. I'm struggling to work out how you used the machine. Did you read the instructions?