Hello, I am having the same problem with the receiving end of phone calls with my galaxy buds. The sound sounds almost like a frequency issue. I did find a temporary fix. Place buds in ears, make your call, remove right ear bud, let it shut off, the noise then should stop and you can replace you right bud. This solution worked (for me) as long as I did not remove the left bud. If I removed the left instead of the right the noise immediately started back up again when it disconnected. I hope this helps samsung locate the problem and get an update out to fix it. Dont give up on your buds, they are to awesome.
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