Experienced Plumbers? Lots of details...?

you can install an in line adapter to both the incoming pipes to the washer machine, called hammer stoppers. they can be bought at hardware store. They need to be soldered in to place which may require a plumber. This is not a uncommon problem and is an easy fix, ask plumbing guy at store he should know about them. Or call a plumber he can explain easily over phone. If you mechanically inclined you should be able to install on your own