It's likely due to a problem in the defrost drain or a leak in the ice maker. You may be able to solve such problems quite quickly, possibly in just a few steps. Have the owner's manual available to help you find
Some models have a selector switch to allow for a manual defrost cycle. If your freezer has this setting (check your owner's manual), ensure that the switch wasn't set to defrost accidentally. If the freezer was in a defrost cycle, check it in about an hour to ensure it is working.
When the defrost system kicks in, frost buildup on the evaporator coils melts and water is collected in a trough beneath it-more than usual. It is funneled through a defrost drain tube or channel down the back of your refrigerator and collected in a drain pan, where it is then left to evaporate.
Often, the defrost cycle turns off before the water can finish draining, and the refrigerator continues to cool. Ice buildup then forms along the system, and eventually water collects and puddles in the bottom of the refrigerator as melted ice continues to drip from the evaporator coils.
If there is ice buildup, allow the unit to thaw:
1. Remove food from the entire unit, storing it in coolers packed with ice, and remove the freezer shelves. Unplug the unit.
2. Using a screwdriver, remove the panel inside the freezer at the back to access the evaporator coils and trough.
3. Leave open the doors and allow the ice in the trough and along the defrost drain system to thaw by itself. This should take several hours. Note: Keep plenty of towels around and be prepared for the drain pan to fill quickly.
4. When thawing is complete, replace the panel and restore power to the unit. When it is cooling again, replace the food.
For more troubleshooting steps and simple solutions, read Freezer leaking water
. I hope this helps!