When I move the tub of my front load washer back and forth with my hand, I can hear and feel (water behind the tub slushing around (I'm talking quite alot) after every load is finised. It also, always has a musty smell with mold forming around the seal. The repair man says that this is normal, I say he needs to find another occupation. Who's right? Please, help me fix the problem! Forever grateful, therese