Small items can leave the basket
During washing and spinning, small items can sometimes work their way over the inner basket or into gaps around the tub. If they reach a drain hose or pump, the result may be a slow drain or a washer that will not drain at all.
Keep small items contained
Use zippered mesh laundry bags for socks and other small garments, check pockets, and avoid packing the washer too tightly. If a washer suddenly stops draining after a small item disappears, do not keep running cycles until the drain path is checked.
Safety note: Appliance symptoms can have more than one cause. Disconnect power and water when manufacturer instructions require it. Do not remove panels or perform electrical work outside your training.