Tried to do a search but could not find answers. My 20 year old Whitfield Profile 30 is having pellets missing the pot, seems to be worse can see a layer of unburnt pellets just laying there. When it gets hot enough they do ignite but I don't know if this is a good thing. What would cause the pellets to fall outside the pot, seems to be worse at start up? The pot is not full enough to cause an overflow so it must be the initial input of pellets. Is there an easy fix?