Kitchenaid side by side refrigerator

First thing I would check...is this unit frosting up? Turn it off for two days...with the doors open...to defrost completely. Clean out the condenser coils with a brush. Inspect and clean any gaskets not sealing. When restarting...open up the back panel and check the compressor. It is that big black thing. Find and clean off the largest pipe. Watch the pipe...It will frost initially on startup. Does the frost remain after 5 minutes or turn to ice, water or dry out? If still frosty, you are low on gas. If other conditions, then you either are opening the door too often, those gaskets are damaged or you have defrost issues.