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

My problem with this unit is it's unreliability. I love the concept, and when it works - this thing is the best coffee maker I've ever owned. Unfortunately I've now gone through 2 of them. Each time they just stop working. I'm guessing it's electrical - either a switch, or something with the heater. It's too much of a pain to send it back to get serviced. I hoped my first one was a lemming, but my second one has just done the same thing. Googling I found this is a common issue. Shame - if they could solve that, this thing would be unbeatable.