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

I've had this a while (a few years), and it was very pricey. Now it doesn't work, it makes a buzzing noise for quite a long time when first plugged in (or the power comes back on after being off). Also the display showing how many amps is being consumed flickers and no longer displays a correct value.I'm unhappy, as something super expensive like this should be much better quality.