Chevrolet: Windshield Wipers, chevy venture van, 2000 chevy venture

Question
I own a 2000 Chevy Venture van and I am having an intermittent problem with the windshield wipers. Occasionally when I turn the wipers off, they return to the stow position but then they immediately pop back up. Then they try to return to stow but again pop back up. This cycle repeats itself over and over again. To get it to stop, I turn the wipers on and off until they finally stow properly. It may take several tries. Any ideas about what the problem is and how I can fix it?

Answer
I'AM NOT UP ON WIPERS BUT IT SOUNDS AS IF THE SWITCH MIGHT BE BAD OR A RELAY ,AS IT SHOULD BE TESTED WITH THE PROPER EQU. AS WITH ALL THE NEW CARS  EVEN MY OWN WITH OUT A COMPUTOR TO PLUG INTO THE CAR YOU ARE IN TROUBLE AND HOPE THAT YOU DO NOT GET RIPED OFF AS TO OWN ONE FOR MY OWN USE WOULD COST THOUSANDS I WOULD RATHER BUY TWO NEW CARS FOR THE COST OF A GOOD COMPUTER SET UP, IT SOUNDS AS IT MIGHT BE YOUR SWITCH OR A RELAY IF I HAD IT I COULD LOOK AT IT
SO I TAKE A GUESS AND SAY THE SWITCH OR RELAY OK  I WISH I COULD HAVE HELPED YOU MORE
ROGER