Somwhere in the house there should be whole house water hammer arrestors. If the house is 9 years old there is a chance that the air in those has been absorbed into the water and greatly diminished their ability to handle the problem.
Step one would be to recharge the air in the whole house arrestors.
1.shut the main water supply valve off.
2. Open a faucett at the lowest point in the system to drain the lines (Laundry sink in basement or an outside hose bibb.
3.Open both a hot and cold faucett at a high point in the system to vent air into the lines while draining. (Best point is the bathroom lavatory sink in the bathroom of the highest floor which has plumbing.)
4, When the water stops draining out, close the faucett at the drain point and open the water main to refill the distribution system.
5. Watch the water flow at the faucetts at the high point. It will hiss air, then sputter a lot of water. When it has a full flow of water turn the faucetts off.
At this point the whole house hammer arrestors will be recharged with air. You will now need to go to each faucett in the house and vent off any excess air until you get full flow.
Flush the toilets also. They may sputter a bit when filling begings but it will stop fairly quickly and no problem.
Take both ends of the washing machine "hot water" hose off and examine both the ends of the hose and the port into the washing machine water valve. Many hoses and water valves have a screen attached to the hose washer, Chech the screens to make sure they are not obstructed with scale or debris.
If these steps have not resolved the problem it is an internal problem in the washing machine fill valve. Solution-Replace the water valve on the washing machine. (This is a simple DIY repair.)
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