Dismayed with my Keurig Coffee Maker - Any Suggestions?

My Keurig coffee maker is doing the same thing as I see others complaining about: shutting off immediately after you hit the button to dispense the coffee. There's enough water, it says it's Ready, but all I hear is a slight "clunking" sound as it stops...I had to go to Starbucks today! I hate investing another $100+ in a new Keurig if this is a perpetual problem! My machine is about 1.5 years old. Any suggestions?