Hope someone can help me find the problem? When riding up hill in the lowest gear my bike will shift down the cassette to a higher gear. It will do it twice and stay there. I am riding on the hoods and can feel a click inside the hoods. Could the problem be there? Just incase someone thinks I am bumping the lever with my hand, it will shift when I am not on the hoods. Not sure if it is the Campy Record derailer (about 5 years old) or in the shifter itself?

Thanks for any help.