Left earcup didn't get any sound when using bluetooth mode

Hi, I own a Marshall Monitor ii ANC. The problem with the headphone is, when using wireless mode, the sound produce at left earcup was delayed, then after few moment it will making buzz sound and then the sound was equal for both earcup, I suspected it has to do with the board or chip, all wire checking was intact. If using jack both working well with no issue. Is it possible to get the board replacement for it?