If your freezer is vibrating or rattling, check the below:

• Be sure the freezer is level. If your freezer rocks on the floor when it is moved slightly, level it by adjusting the leveling legs or by using wooden shims. You should also check to be sure that the floor can adequately support your freezer.
• Check to see if the freezer is touching the wall. If so, move it slightly or re-level it.
• Remove any items that are on top of the freezer.
• Check items inside the freezer. It is normal for items inside the freezer to vibrate somewhat. If it seems they’re vibrating too much, try re-leveling the freezer or moving it slightly.