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That sounds like a regulator that either needs to be adjusted or replaced. Most shops can do this for you. A new regulator is about $25 and may be cheaper than having yours adusted. Be sure that the LP detector is on as that will shut off the LP flow. Those are the things to check first. Then get back to me if we need to dig deeper into this as all follow ups are included in our fee.
Just checking back in to see if you were able to get this resolved or do you still need additional input from me here?