Thermador Oven wont stay on

Hello, any help would be greatly appreciated. Our oven, the Thermador PGR364GL is never the same, You set the temp to 450 it will heat up and only go to 250 -300 then it shuts off or the temp never goes up after that . Also, the broiler, will light up for a minute or two then it turns itself off, sometime will come back on for another minute or two then off again, I am thinking either igniters, or thermostat …unless there is something else that triggers it to stop…the burners on top are working fine by the way. I a m ready to order the parts but any help from this forum will be greatly appreciated. Thank you

Sorry for bring up an old topic I also have a PRG364GL.

Did anyone figure out how to fix this? I have the same issue.

Need help my Thermador MODEL P364GEC over/broiler won’t stay on. Set the temp to 450 it will starts then shuts offs. Also, the broiler, will light up for a minute then it turns off. I changed the both igniters but the same thing. I am thinking it might be the thermostat …unless there is something else that triggers it to stop…the burners on top are working fine. I am ready to order the parts but any help from this forum will be greatly appreciated. Thank you.