Volume, sound settings, or other functions may change after you reset the speaker. How to reset (restart) the wireless speaker: If your wireless speaker has a RESET button SRS-XB12 / SRS-XB20 / SRS-XB21 / SRS-XB22 / SRS-XB30 / SRS-XB31 / SRS-XB32 / SRS-XB40 / SRS-XB4...