Moist outer surfaces, a spill or tightly packed fresh portions can make bags adhere as they freeze. The block does not automatically prove the appliance warmed previously.
What the observation tells you
Forcing it apart with a knife inside the cabinet risks puncturing packages or the liner. A large joined block also makes it difficult to retrieve one portion without warming others. Check whether a liquid container leaked nearby.
A useful next step
Use suitable packaging and separate portions in the permitted loading arrangement when first freezing. Handle an existing block through a safe food-storage and thawing plan rather than levering it against appliance parts.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.