User Manual Frigidaire FFU1152DW 11.2 cu. ft. Upright Freezer

Odors in your freezer can be caused by how food is stored. Some foods have a strong odor, so be sure to cover them tightly. Sometimes odors can also be caused by certain containers and wrapping materials (such as paper, foil, or plastic). If you think this might be the case, try using different containers or a different brand of wrapping material.
After you’ve checked how your food is stored, try cleaning the interior of your freezer with a sponge, warm water, and baking soda.

If the freezer temperature is colder than you’d like, turn the control knob to a lower number and allow 24 hours for the temperature to stabilize.

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.