I have had the exact same problem for almost a year now. At first we would be able to get away with lighting a burner to start the gas flow, but then that stopped doing the trick. The next work around was to close and then reopen the valve where the gas comes in (assuming it is the regulator) and goes into the two different directions. (burners and oven) The oven would shut off when it reached the correct temperature, but would not go back on. The glow light would remain lit. We would then ignite a burner, and the oven would fire up again. Sometimes working from that point on, and sometimes not. Most recently, we tried turning the oven on, and the glow plug did not go on at all. It seems like it had been getting progressively worse, and now not going on at all.

I think maybe it may be the glow light element that was going out. If that is it, I woud have a hard time understanding why it would fire up when I closed and reopened the valve or lighted a burner. I am open to additional feedback also. thanks, Gary