Instruct: Classify Amazon reviews into positive or negative sentiment
Query: poor quality

this machine produced an insane amount of bubbles - at first. I took very good care of it, kept it free from dust, cleaned with warm water after each use... but after the 4th use it stopped working. the machine runs, but there are no more bubbles. I think it is a problem with how the pump dribbles the solution over the wands. If I tip it, I might get a little something. I'm very unhappy considering what I paid for it.