Hello, I am having an issue with my natural gas fireplace. It is a Vermont Castings Stardance model. I can get the pilot light started but when I turn on the main burner via the remote or the switch attacked to the fireplace, it won't start. Sometimes if I turn on the burner and leave it on, it will randomly start after a period of time. However, if I turn the burner off and try to start it again immediately, it will not start. Does anybody have an idea what may be causing this?