Hi, I am having issue with Firefox 8 Gas Stove from Percy Doughty supplier. On turning the ignition on, the gas stove switches itself off after some time, in some cases after 10 mins or even after 2-3 hours. The gas stove was fitted by Gas Safe Engineer and all the instructions had been followed. The gas stove works perfectly fine when opening the door of the stove and doesn't switch itself off. Is it possible that dust collected below the gas stove around the heath area could affect this?