Water pooling and freezing into a solid block of ice at the bottom of a freezer is almost always caused by a clogged or frozen defrost drain tube. During automatic defrost cycles, frost on the evaporator coils melts into water that is supposed to flow down a drain hole into a pan underneath the appliance to evaporate. When that drain hole gets plugged with food debris, slime, or ice, the water overflows, runs down the back interior wall, and pools in the bottom of the freezer where it instantly freezes into a solid sheet. To fix this, you need to remove lower interior panels, melt the ice, and flush the drain tube with warm water using a baster or pipe cleaner. You can verify this step was successful by confirming water drains smoothly through the hole into the bottom pan.
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