Hi everyone. After years of reliable use, the burners aren't staying lit after turning on the hot water. They come on for a few seconds and then turn off. So far to troubleshoot, I've cleaned the pilot light assembly, checked the thermostatic sensor to make sure it was clean, checked the cold water inlet screen, checked water flow rate at tap, and recalibrated the thermostat. The only change I've noticed is the pilot light seems to be bigger than normal, and until I cleaned it, it was burning more orange than usual. Now its burns blue, but is at least double the size I think it should be. Any tips on what to try next? Thank you!