Looking for a little help fellas..... My stove goes thru its auto start with no problems. The unit burns well for about 10 mins, then the flame starts to get yellow, flickers and black soot starts forming. The stove continues to feed pellets and the burn pot starts filling up.Burn pot fills with a thick smoke hiding the pellts below. I notice as this happens the combustion motor is slowing down to a very slow speed. If i shut the power down and start it back up, the blower kicks up to a faster speed and smoke clears going back to a nice burn, only to repeat after 4-5 mins. Once it gets up to a good operating temp the blower motor slows down. Wondering why the motor slows down, causing bad draft once it gets hot..... any ideas would be appreciated. BTW.....i have no manual to help me with trouble shooting this stove....