Thank you for your question. It is concerning when the refrigerator is not functioning correctly. I will answer the question generally, as I would need a model number to give a specific answer.
The most common cause of this problem is a clogged defrost drain under the freezer evaporator coils. This could be from plastic flashing or the refrigerator could be off level, leaning toward the front, allowing the water to seep over the lip of the drain, located under the coils.
If you reply to this thread and provide a model, I will gladly give you specific checks to make.