1999 Chevy Cavalier headlight switch

Electrical problem
1999 Chevy Cavalier 4 cyl Front Wheel Drive 145380 miles

I have a '99 Chevrolet cavalier Z-24 convertible and my headlight switch on the steering column keeps burning out. It seems fine if I don't use the high beams at all. But if I do, the switch starts to malfunction. First the headlights won't come on unless you hold the switch stick a little forward( I use a book of matches), then after a while the switch fails altogether and the headlights don't come on at all. I've replacement this switch assembly about four times now. When I take the switch out you can see on the plugs going into the back of the switch that the plug has been overheated and scorched. Any help will be greatly appreciated.