Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Sometimes great

I'm so disappointed! My daughter received this toy for her 3rd birthday, 6 months ago. She loved it. We got the special edition Cinderella one. The Dora book pack worked just fine. For Christmas/Hanukkah, we bought her several more books from [...] Half of the books worked, and the other half do not. There's no explanation!