Your thermostat is on the way out,
this fridge does not have a super freeze button
listen to the inside of the upper cabinet when the fridge is running.
You should be able to hear slight hissing/gurgling sound as refrigerant circulates, that indicates the fridge has got enough gas to do it's job.
just replace the thermostat, very simple task,
it's mounted inside the upper right side of the chiller next to the lamp,
Please make sure you disconnect the fridge from the mains before making repairs "unplug it"
Graham, February 2011