I have a Thermador PG364GLBS/09 Purchased used. Previous owner stated that oven randomly shuts off. After installing it the stove top worked fine but yes the oven did shut off on occasion. Mostly the cooling fans would never shut off after use of the oven. I replaced the Master Mother board. Now the oven still does not work properly. When I turn it on to bake. It goes up to about 200 degrees then shuts off. Randomly it will turn back on and you will hear the ignitor but no gas. Somtimes you wil hear the gas and it will light. Sometimes it will reach proper selected temperature then shut off. The temp gauge will stay at the selected temp, the heat light will stay lit but the oven shut off. Once I turn the bake switch to off the temp gauge will go down to the actual temp then. I am whitts end with this unit. I need some advice. Thanks