Freezer doesn't keep ice cream frozen

not being able to keep ice cream is not good, before doing anything ck a few things. make sur e to pull out unit and vaccuum under and behind unit, if it cant breath it cant freeze. check in back by compressor, is the fan running to cool the fan??? if the compressor is on so should the fan be. next id look behind the freezer wall for excessive build up of frost( it might even be buildin up with ice throughthte back wall, inwhich case you have a defrost issue