I have had that model heater for three years now and I like it alot. No problems. Mine does not have a thermal couple or the push buttom ignition. Maybe that is the trouble. I would bring it back and see if you can get a new one.
One question. Why did it go out? OK two, And does it have a thermal couple? I also have the mr. heater / cooker with a thermal couple. One night It went out after a fish was thrown on it, Which is another story, I relite it right away and it went right out again, Then I waited 5 minutes and no problems. Lite right up and stayed on. I think that the thermal couple had to cool down befoe being relite.