I will be happy to help you out. Can I get the model number to your fridge? Also, can you check the rear panel on the inside of the freezer, look for any frost or ice build up on the panel. One more thing to check for me, the flap where the ice comes through the door, check to make sure that it is completely closed.
Let me know what you find and we can go from there.
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It sounds like you may have an issue with the freezer fan. The fan blades could be loose on the motor shaft, a blade could be broken off, the blades could be rubbing something. The fan will shut off when you open the door on this model. That is more than likely why the noise stops when you open the door.
I would look to remove the inside rear panel of the freezer and investigate the fan.
Once you have access to the fan, hold in the light switch with your and see if you can identify the source of the noise.
Let me know what you find.
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Have a good night,