It does this about once or twice a month—it shuts off by itself, and refuses to ignite for several hours after that. The next day, it’s working fine. It’s only a few years old, so it has pilotless ignition. This usually happens after it’s been on for a while, but occasionally it happens soon after ignition, even before it’s come to full temperature. What gives?
The oven ignition source is usually a Glow Bar heating element and not a spark. This element can go bad or the connection to it, allowing the element to work at times and fail at times after thermal expansion occurs. This may be the problem.
The oven valve that allows gas to the burner may be bad, but usually it’s not activating because of a failure in the circuit that powers the valve. The glow bar is part of that circuit. A glow bar can also still heat but be damaged and not allow enough current to pass through the oven valve to activate the gas to the burner.