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The water valve is on the back of the refrigerator where your house's waterline connects to the refrigerator. It has to sides out of it. One goes to the water dispenser and the other to the icemaker. These do tend to be the problem.
If you remove the water lines that feed that two areas while leaving the house's waterline connected you can see if the one going to the icemaker is leaking. It is not supposed to leak water. It should only open the valve when the icemaker calls for water.
If the valve leaks then you replace the whole valve.
Please let me know if you would like more information or clarification. We will need you to post the model number from the inside wall of the fresh food compartment to give specifics.
That would be unusual. I do remember one where a new filter was causing the problem!
If that line was clogged, it might mean that you have defrost problem or that the refrigerator's thermostat was keeping things too cold and freezing the line.
Your welcome and thank you for the accept and bonus. You can post back at this question for a couple of days if you would like more information about this.