Good suggestions so far. If the problem just began after operating on gas while driving for many mile with no problem, then I don't suspect the flame blowing out due to air currents. Do check the gas jet and clean if necessary. What I suspect is the thermocouple that tells the control board that the flame is burning, the wire from the thermocouple to the control board, or the control board itself. If the thermocouple wire has connectors clean them. If no solution replace control board and perhaps the thermocouple.
These people can supply the board and I expect they can help with troubleshooting tips.
