Repowering can work here
I had a fairly new fridge that was not as cold as it should have been (in high 40s) some years back. After cleaning it and not having success, I unplugged it for a few minutes and powered it up again, and all was fine. It seems that sometimes a brief power outage can disrupt things - and we had a few at the time. Keep an eye on the fridge - your problem may be solved.
Not sure of the electronics in refrigerators, but I know that repowering works wonders for TVs, DVD players, and computers.
Drywall Taping & Finishing For Beginners