Hello Frank, I am lurker here but air roast often. It sounds like your air popper is stalling just before the second crack. There is a mod to bypass the thermostat that will stop this. Or you could wait two more minutes 15 (heater comes back). I am using a varic so after the second crack I deal the voltage to 115 volts this brings the roast time down to 12-13 minutes with Sumatra. My popper is unmodified. www.coffeechaser.com PC Magazine’s 2007 editors’ choice for best Web mail—award-winning Windows Live Hotmail.