My water heater is about two years old and the pilot has been a problem since day one. The pilot light has repeatedly gone out with no obvious pattern or circumstances. One thing that dawned on me when lighting it yesterday, however, was that there is often a delay between the gas releasing and the burner igniting. Consequently, there would be a small burst of flame when the burner ignited. So yesterday I bent the pilot tube so the flame continues to contact the thermocouple, but the remainder of the flame is closer to the burner tube. Now, when the burner ignites, it does so with virtually no delay at all. I've only had it set like this for a single day, but so far no more occurrences of the pilot going out. My thinking is that the little burst of propane igniting may have essentially blown the pilot out on some occasions.