Check for birds nest or spider web in top vent if on roof.
After looking again, I see you have a 3455sa, our 2010 had a fan to draw air through the coils.
Turning the fridge on its top was called burping, it is not recommended on models as new as yours.
A skilled tech should be able to tell you precisely what is wrong.
If it proves to be the cooling unit, you can Oder them new and rebuilt, shipped to you.
Is there a failure code on the front of the fridge? If it does it probably needs a new circuit board.
Good Luck!
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