I have an avalon Lopi AGP stove i bought in October. The stove has been working great so far execpt for ash build up in my burn pot. There would be so much that i could not get a re light and have to remove the ashes. This issue just started in the last few days. Im running on medium, and clean my stove every few days. Is this normal or should i check something else. Right now im running t stat mode 3