I've learned alot from the smart folks here. I'm hoping you can help again. my quest stove has been acting up. About 5-6 hours of run time and the grate will clog up with hard deposits. I've done 2 complete clean outs including both fans. Do not have a gasket leak. It burns very well for those hours and no glass deposits. After clearing grate its good for another 5-6 hours. Burning Turmans or Hamers. So presumably not a crappy pellet. Last night I took a wire brush to it then coated it with graphite. Restarted around 11pm. At 630 am grate clogged and running up tube. what the heck is it??