Does the noise seem to be coming from inside the fridge itself?
Appears to be from the inside, bottom section of the fridge
Ok if the noise is getting quite loud then it may be a restriction in the evaporator causeing this. As if a bit of oil gets pumped up from the compressor this can get into the evaporator so when it sprays the gas in there its restricted and this is what cause the noise.
But im afraid when this happens there isn't much you can do. You can try and get someone in to try a regas and see if this cures it. But if it doesn't work then theres nothing else you can do. But a regas is quite expensive and theres no sure thing that it will work as well.
Sometimes this doesn't stop it from working. It will still work fine like this. It will just be noisey when its spraying the gas into the evaporator.
If you need anymore info just get back to me.