I think the old washer could not handle the medium sized load and stopped spinning before allthe water came out.
I read somewhere about resetting the motor. Has this worked for anyone or what else could it be. The switch works when I push it in manually with the lid open

It sounds like a solenoid is bad, but you will need a volt/ohm meter to know for sure. Here are some manuals to show you how to fix it easily: https://dl.dropbox.com/u/8010163/Understanding%20automatic%20washer.pdf
https://dl.dropbox.com/u/8010163/Whirlpool%204322537A%20How%20to%20use%20Test%20Equ ipment%20Service%20Manual.pdf
https://dl.dropbox.com/u/8010163/Whirlpool-Kenmore%20washers.zip
Just use your meter and you will find the problem. You should read from 500-3000 Ωs on most solenoids that are 120 volts.