I have a Lennox G12 furnace. I keep the pilot clean with annual maintenance. The filter is new. The thermocouple appears to be working as it kept the pilot lit all summer. Now, when the thermostat is turned on, everything does as it should, all thru the blower cycle. However, when it's time for the burners to turn off, the doggone pilot light goes out with it. The pilot re-lights easily, and stays on until the next cycle when the control valve turns off the gas to the manifold and burners, and then the pilot goes out as well. That's the only time the pilot goes out, and I'm pretty sure the control valve and pilot are separate circuits. Any ideas on this.?