Hi, I had the same problem with my Galaxy Buds Plus and successfully solved it. So what causes the problem? The problem is earwax filling up the grill. Even though you have cleaned the grill from the outside, it can appear clean, but still be quite clogged. The solution is to remove all the earwax. How to fix it: 1) Take a sewing needle (it needs to be very “sharp” or “pointy”), insert it into any hole of the grill and gently pry out the grill from the earbud. 2) Once the grill is off, you will see the backside of the grill is a black mesh. You will also notice that there is a small ring of adhesive tape falling off the ring around the grill edge. 3) Now you need to push the earwax back out by pressing the black side. For this, use a cotton swab - it helps to distribute the force evenly across the black mesh. 4) When pressing from the black side, you will see some earwax coming out the grill holes. I used a cotton swab and some isopropyl alchohol (any alchohol is fine, I guess…) to scrape it off. Repeat...
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