Four days ago, I posted a question about my Enviro Milan not staying lit. Everyone recommended I clean the ceramic sensor. I took it out, and cleaned off all of the crud, put it back in, and I got fire on the first try. I thought everything was OK, but I just cleaned the stove, and it would not stay lit again. I took the sensor out again, and it was covered in black soot again. Not as heavy as last time, but still covered in soot. I cleaned it off again, and got fire on the first try. My question is that is this normal to be covered in soot again after four days? Is it supposed to do it's job of sensing covered in soot? Is the sensor in need of replacement? Or, is something wrong with the stove that the sensor got covered in soot after four days of use?