That loud banging noise you hear the washer making, even though no article of clothing could be causing the noise, could be an inlet valve that has shut. This causes water to rush through the pipes before coming to an abrupt stop as it reaches the closed valve. Installation of a water-hammer shock absorber at both hot and cold water connections can alleviate this headache- but it's also time to schedule a service call with your appliance repairman, so he can properly look over the inlet water valve and machine.
In the unfortunate case that the interior of the washer tub becomes chipped, rust can then develop and become a persistent problem in your machine. Rusty water in the washer causes rusty stains on your clothing! You can use a clear nail polish to coat over any chips as a short-term solution, before the rust becomes a significant issue. However, it is definitely time to call your appliance repairman!