kenmore range

[daac]

The problem I am having is that first I turn the oven on and allow it to preheat to whatever temp. Then after it heats and bakes for whatever time frame (1 hr 5 hrs) it dosen't really matter, it then starts giving trouble by it calling for heat, gas flows and the ignitor clicks it ignites and burns for a few seconds goes out and then tries to relight again. After a few times of this it locks out and wont heat anymore. Whats the problem??? is it just the spark ignitor or somthing with the gas valve or what???   Thanks

Model 66575179300

[JWWebster]

This Direct Spark Service Manual shows how to do the checks. Your machine is known as a DSI model.
It uses a direct spark. The only thing I can think of is something is getting hot after an hour or so. Might be a solenoid in the gas distribution valve is getting hot and quitting.

[appdoc]

I had one with simular problem, cured with new burner ignitor asm part # 8190618. has something to do with proper air flow when oven is warmed. new part is modified design.