The pilot light on hot water heaters is controlled by a thermocouple, a small copper rod that usually sits in or very close to the pilot light flame. When they go bad, which is not unusual, they do not allow the gas line to stay open and feed the pilot light. The easiest thing for you to do would be to replace the thermocouple. When following the pilot light lighting instructions, be sure to hold the valve button down for 30-45 seconds in order for the pilot light to heat the thermocouple prior to turning on the gas burner.
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