Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Gave up after trying 2 different cables from this company

The first cable didn't work at all. Amazon.com promptly sent a replacement cable.After the first week, the 2nd cable's performance became intermittent. When watching movies, dialogues sometimes sounded muffled, then the sound would clear up. Later the problem worsened with 1 channel almost disappearing, causing voices to be hardly audible while the music was loud.