It is estimated that over 1,500,000,000 socks go missing every year. That's 4,115,000,000,000 individual socks that have been lost in the wash.
Some are eaten by the washers, some are eaten by the dryers, but most are simply... gone.
Start by checking your laundry room for any signs of sock disappearance.
Use a lint roller, but don't expect it to make much of a difference.
Consider performing a ritualistic sock dance to appease the Sock Goblins.