My kitchen aid mixer works just when plugged in it won't turn off. I believe it has to do with the speed lever control. When I have it plugged in it will not lock in the off position it will automatically go into the 2nd speed. What would you say I would go about to fix this problem?

My kitchen aid mixer works just the problem is with the speed lever it won't stay turned off it keeps sliding into the second speed. What do you think I need to do to fix it?