We had the same problem one time on our new Big Sky. Found that the tank can block the flow when it senses something wrong. We unscrewed the line from the tank and tapped on the tank a couple times and that cleared it. It's worked properly ever since. The temperature at the time was below freezing. We asked a repair shop about this. Their verdict was that the safety in the tank sensed a piece of ice and would not permit gas flow until it was cleared.
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