We have a whirlpool 465 gas stove. We were baking and noticed that the oven had shutoff and was cooling. We pushed the bake button to re-start the oven and adjust the temp. It has happened twice in an hour.

Look at these: https://dl.dropbox.com/u/8010163/Whirlpool_Gas_Ovens.zip
https://dl.dropbox.com/u/8010163/Whirlpool_Gas_Range_30_inch.pdf
You have a safety opening somewhere. You will have to find it and find out why it is shutting off. Is this stove vented? It seems like a place to start looking.