I just had my first bad experience with Amazon customer service, and even then in the end they made it right. I got a new K4, plugged it into my computer, and got a connect-disconnect cycle over and over and over again. The CS lady had me try it with a different hub, two different cords, and a different computer, and kept having me try things even when I kept telling her that it was unacceptable to behave that way when my k3 behaved perfectly with the same setup. Ultimately they did agree to take it back and send me a new one.
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