Refrig OK, Bottom Freezer not cold

The refrigerator temp is within spec of about 38 to 40 deg, however, the freezer temp varies between 50 and +14 deg.The compressor seems to be running because of refrig temp but it does not seem to be running consistently when the freezer temp is in its hi temp range. I hear no relay clicking at random. What would cause this, the deep freeze control, other thermostat, or?