Works but last unit only lasted 3 months!

On my 3rd unit (Kenmore Elite refrigerator). The first unit lasted a couple of years, the 2nd unit a little over a year, the 3rd unit about 3 months. They worked fine but it seems that for whatever reason the quality is getting worse. On my 4th unit (let's see how long this one will last) and purchased 2 more as for a little over $20 is cheaper than getting someone to fix it. If I can average about a year per unit it is worth it for me.

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