Disabled volume - DAC power off

Has anyone noticed that if the volume control is disabled it will become enabled upon powering on the DAC?

I have been using a number of DACs (SMSL, XMOS) via USB, and as the DACs have a volume control I have disabled the volume slider in Volumio.

But when the DAC is switched off and then on again, the volume control (hardware mode) is re-activated. Is there a way of stopping this?