My Galaxy buds left side has gone quiet sounds like the speakers dying, but ive only had them for about 6 months, its clean and there no problems with volume as the right side if fine, is there a problem with the speakers.
This has happened to my son's buds and I have fixed the issue. Remove the little speaker grill and remove the black filter and you will see full of ear wax. Clean it all out and clean the old seal out and I ran a little bit of silicone where old seal was to keep grill in. To get grill out I used a fine needle used for my coffee machine
A very thin one would work. Just run it around the edge first between the plastic and silver bit to break the adhesive. Then put needle in middle only a little bit and pop it out