[villagetinker]

Some other people have reported switch problems, and a simple change out of the switch with a new one solved the problem. Since you have 4 lights, it could very easily be a loose bulb or a failing socket the bulb is screwed into. First check that all bulbs are tight, then try unscrewing one bulb at a time and see if you still get flickering. If so I would definitely look into replacing the switch. A local handyman can do this for you if you do not want to do this. If you find it is a single bulb the socket MAY be replaceable depending on the design of the holder, in this case it might be better to just replace the entire fixture.