Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Argh!

Less than 30 days after installation, ports 27 & 28 stoped working. This problem was painful to diagnose due to our LAN configuration.Netgear customer service was easy to deal with, but charges to ship a replacement before receiving the defective unit. If you need to keep your network up until the replacement comes, you'll have to pay.Update: The replacement unit is still working now after a few months but I wouldn't give it any more stars.