What is your sock strategy? Do you have all your pairs of socks look the same so you never had to deal with getting the right socks paired up? Or do you have all-different socks so every sock is paired up with exactly one other?
If you have read the fairly-recent sockophagy thread from about a month ago, you will see that we have talked about this at length.
By the way, your sockophagic laundry appliances might simply be eating your socks a bite at a time. That sock with the hole in it was already partially eaten.
ETA: Almost forgot the link. Here 'tis: