Instruct: Classify Amazon reviews into positive or negative sentiment
Query: disappointed

When I first purchased the headphones, I was pleased with the sound quality and the fact that others did not have to suffer from a loud television when viewing shows with me. Within a month, there was a buzz in the left earphone. It was tolerable, but continued to get worse. Today, I am shipping the earphones back to Sennheiser because the buzz is overpowering. I hope that they will honor the warranty.