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I have read some of the posts on here where the brewer inadvertently stops working. The first one I purchased quit after 2 days. The replacement stopped working after 2.5 weeks and acted the same way--just wold not make coffee. If this happens to you, the problem might be (I discovered this by accident and I blame Keurig for not putting some note or instructions in the paperwork) the piercing needle is plugged with debris or coffee grounds. The unit detects excessive back pressure and stops. All one needs to do is get a paper clip and open up for one piece of wire to insert on either side of the needle to remove and debris. After doing that, the unit worked fine. If you call Keurig, they will send you a device to clean that port as well. If your unit tries to make a cup then stops short of filling the cup, try this first.