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This could be caused by excessive gas manifold pressure (you need a gauge that reads in inches WC to set it properly) or inadequte air for combustion. If there are shutters on the burners opening the shutters could also help.
Gas valves usually last longer than 9 years. I'd suggest you buy a pressure gauge that can read in inches WC and check the manifold pressure. It should be 3" to 3.5 ". If it's higher than that you may be able to adjust the valve to lower the pressure. If not then replace the valve
Ok, I'd appreciate a favorable rating.