How are the flames on the cooktop burners? Are they normal? If so, there may be a seperate regulator for the oven burner that has gone bad. If not, it sounds like the orifice for the oven burner may have fallen out.
Example:
https://suburbanrvparts.com/suburban...sembly-521090/
After looking around, it appears there is just one regulator that serves both the top burners and the oven. So, if your top burner flames are unusually high, the regulator is most likely the problem. If they are normal, take a look at the oven burner orifice.
Bruce