Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Doesn't stay together

My 3yo son got this toy as a gift. It's a great idea, and loads of fun to put together in different ways. However, he will put it together, turn it on, and in setting it down to let it run he'll bump something and the pieces fall apart. It is very frustrating to him. Great concept, I just wish the pieces fit together a bit tighter.