Volume is not adjustable

My beat buddy’s volume knob is not adjust the volume anymore. When I load a drum piece then it flickers (numbers changes quickly) and afterwards the volume on the display does not change the knob is turned nor that the sound output level change.
That said I can change the volume on the phones volume dial.

I have installed the latest firmware 1.8.5 and the volume knob is solidly mounted and turns freely.

Please contact support@singularsound.com.