During the spin cycle, when it reaches the fastest spin, my machine is making a really loud banging noise. It sounds as if it\\\'s knocking LOUDLY against something, but is fine throughout the rest of the wash. I have taken the lid off and had a look inside while doing a wash, but can\\\'t see anything obvious. When I spin the drum by hand, there is a slight tapping/knocking noise. Please advise!! Thanks.