Maybe someone could help me because I am new to pellet stoves...... I received a englander 25 Pdv from a family member I have cleaned the entire stove very well throughout installed a new exhaust vent system I am burning tractor supply pellets as I also got 7 bags with the stove..... My problem is the stove burns great for 6 to 7 hrs then seems to pile up with pellets on the burn pot these stove is set to all factory setting but it just gets lazy and I'm not sure why..... Has outside air....I cleaned it again but still keep getting soot after about 7 hrs is the burn pot clogging up with ash??? Should I try other pellets.... Also sorry forgot to mention I did check to door and glass gaskets and they are fine.... I'm lost the only thing I can think of are the pellets can anyone help or have a similar problem???