GE Frigerator has intermittant Freezing

Question

Model # GSS25LGPA_WW has (for the second time) gone above freezing temperature (32 degrees plus) in the freezer. The first time it happended, we unloaded all frozen food and turning down temperature control to a colder setting "8" (normally at "2"). Overnight it went back to freezing and everything was OK. Last night it happend again with the temp going above freezing in the freezer (even with the setting still at 8). Help.