Hello - I recently bought a vent-free propane gas stove for my living room. The brand is Charmglow. We had it properly installed by a plumber and gas company and it worked great for a few weeks. Now, it won't stay lit. Before the problems started, we had it set to a lower setting (Setting 1 or 2), and the stove goes on and off to regulate the temperature. The pilot light would stay on when it turned itself off and then it would restart again at some point. Now, you can turn the pilot light on and light the flames, but it just turns off and the pilot light goes out too. Sometimes it will stay on for an hour, sometimes it will shut off after just a minute. We can't seem to figure out how to fix the problem. Any advice on what to do? Its only a few weeks old. Thanks.