Ep-t21 right earbud charging much less then left

HI
Received those lovely earbuds yesterday, charged the box then the earbuds, enjoyed music…and noticed right earbud emited 4 descending beeps after 1+hour and stopped playing, while left was still running fine. reput the whole thing in charge during my sleep, and yet again this morning right earbud stopped after something like 70mn while left earbud was still playing. unpairing / deleting profiles on phone/re-apparing had zero effect on that problem, just that right eardbud can’t charge correctly (yet has that red led charging like the other)… is there something that I can do before asking for a replacement ? 1 hour of music for 2 hours of charge is certainly not something expected or acceptable I guess…