volumio 2.586 UI shutdown hangs

I am new to Rasberry Pi & Volumio. I have an Allo DigiOne Signature controlled from 5th generation iPad with 12.3.1 osx. The DigiOne is connected to an NAD 3020 v2 with built-in DAC. When I select shutdown from the Volumio UI menu , the shutdown process hangs. Suggestions for trouble shooting would be appreciated.