A week sgo one of our stoves started to make a grinding noise, my husband sprayed wd40 on the moter assuring me it was safe. The noise went away. Today it is back again. And actually sounded to me like the moter was slowing down almost to stop. So I tunred the stove to the off mode. Worried as I do not know 1) if it dangerous if the moter stops turning while the stove is in the on position? 2) Is it dangerous to spray wd40 on the moter while stove is on? 3) what could the grinding be? My hubby is faithful in cleaning it throughly every week and takes the whole thing apart at the end of each season to clean it..