Soundcore Liberty Gen 1 Buzzing noise

Hey i got an used soundcore liberty gen one unit, the paper said it was warrantied start from may 2022

It was fine 4 days ago, now the right earbud which is the master control of the tws now had constant buzzing noise,
Tried resetting, changing codecs, sucking the nozzle and cleaning
Nothing seems to work and it all happen all of sudden

Did i just buy a junk , is there anyway i can fix it or am i cooked?