Refrigerator repeatedly stops cooling (freezer/lights work)

Our garage refrigerator (Kenmore with the freezer on the bottom) started not cooling in late July. The lights kept working & the freezer kept working, but the top part (the refrigerator section) stopped cooling and the temp adjustment buttons stopped working for the refrigerator section too. We unplugged it for 24 hours & when we plugged it back in, it started working just fine again... until about 2 weeks later when it happened again. This time while it was unplugged, we cleaned & vacuumed under it and behind it really well and when we plugged it back in we made sure it was pulled out a ways from the wall. Again, it fixed the issue and worked fine for maybe another week or so, but then it happened again! So repeated the process and it did the same thing again yesterday!