My Webasto cook top is doing the same thing. Installed in 2019. The cooktop has done it when my voltage is at 13.9. Have heard it is wind blowing in the exhaust or something with the fuel( bad). I thought it was happening after I moved the vehicle (traveling) but it has done it after the stove has been on in the same location. I have started putting the controller down to the lowest setting when I start it and it has be doing good about 10 starts w/ out shutting off.. But I think it is only a matter of time. I took the stove apart and looked at the glow plug and it was clean.