Haier Wine Refrig runs to cold

Question

When I set my wine refrig. (about 2-3 years old) to 55-60 degrees within a few days it igoes down to 37 degrees. The wine is truly at 37 degrees the temperture gage is showing the correct temp. Why won't it stay at its setting of 55-60? Is it the temp. gauge, sensor or ???
Haier HVF042ABL