In response to those with the above problem, I was running downstairs all the time to tap on the blower control switch locatedin front of the gas valve,and it was driving me nuts. I inserted a piece of aluminum foil between the switch and the metal pole it slides in on. I have cycled the water heater 10x and it seems to have resolved the issue. I believe that the foil helps carry the current between the switch and the pole as it appears there is a slight gap between the two. Perhaps over time the switch builds up resistance as it starts to fail and the foil helps to improve the current transfer. Any comments welcome.

Have you filed the contacts clean and checked the spring tension? Regards, Tom