Maybe the quick connect came loose from the back of the pickup itself. I know it seems strange, but ESP usually has soo little wire in the actual pickup cavity, that if you were noodling around in the back, replacing a battery or something, it's posible that you accidentally yanked the quick connect loose from the pickup. Check that. :) If it isn't that, you probably need a new toggle switch. Allparts has super nice ones that last forever.