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That sounds like the control board isn't seeing the flame and shuts down the gas valve. I would have the board tested to see for sure. IF you do need a new control board I would go with an aftermarket board made by Dinosaur Electonics as they are far more reliable. Hope that proves helpful here. Please get back to me if you need more as all follow ups are included in our fee.
Were you able to get this sorted out yet or do we need to dig deeper into the problem?