I have a Dovre DV450 Natural Gas Stove that has worked fine until this year (Came with our house and 3rd season using it). I went to light it and it will not stay running. I push the knob down on the “Pilot” setting and hit the igniter button, the pilot lights up, but once I release the knob to go from “Pilot” to “On” the flame goes out every time. I did pull the stove apart and clean off any residue that may have been on the thermocouple and such. Put it back together and same result. Not sure where else to look.