I'm really starting to think that there is something either wrong with the timer, or a short somewhere in that power is being sent to the spin solenoid on the wig-wag all the time. Maybe a contact that is stuck closed in the timer? This would explain the buzzing sound you hear during filling and why it stops when you lift the lid, and also why the machine is going into spin too quickly. The only thing that is preventing it from spinning while it is agitating is the pressure switch being satisfied, but once it starts draining, as soon as the pressure switch is no longer satisfied, power gets sent to the solenoid and the washer tries to start spinning, and kicks out once the water rises and re-satisfies the pressure switch (as others have explained). Another thing that would confirm my theory that the solenoid is on all the time is if the washer takes longer to stop spinning at the end of the spin period with the lid left closed than when the lid is opened mid way though the spin cycle. If the spin solenoid stays energized after spin, even though the timer cuts power to the motor, the washer does not shift out of spin and thus the brake is not applied, so the spin coasts to a stop rather than brakes. Lifting the lid interrupts the power to the solenoid, causing the washer to shift out of spin and apply the brake.