Aukey EP-T10 left earbud suddenly a lot quieter

I got the earbuds in june 2020 and they worked really well, untill a vew days ago!
The left earbud suddenly startet to be a lot quieter and the right earbud was a lot louder.
I tried to fix it in my phonesettings (Samsung Galaxy S9 plus) but with no success.
Is there anything I can do to resync/make them the same volume again??
Thanks in advance