Mark S Grantom

I have a 2011 Ford Edge Limited. It has been in the shop twice because the windshield wipers have a mind of their own. These are the non-automatic wipers. When I turn them OFF, they will continue to cycle as if they are on the low intermittent setting. (about every 25 seconds) The dealer replaced the steering column switch, which solved the problem for a while, but they just started coming back on again this week. Does anybody have a suggestion on how to fix this problem? Thanks