Make sure the door to the fridge is closed tightly all around...we discovered that a pitcher on the door shelf held the bottom portion of the door open even though the top was latched tightly.
Also, make sure the dial is set toward maximum enough to allow the fridge to make the lower part cool enough. We use a fridge thermometer to check how cool it is in there.
Also, if you have teens (we have two) who use the fridge lots to get food/drinks all day
, opening and closing the door a bunch can really raise the temp especially on hot days.
Hope this helps