USB DAC Stopped Working

I have a Schiit Fulla 3 that I've used on a ThinkPad e480 with Ubuntu 20.04 for several weeks now without issue. Yesterday, the device was no longer showing up in sound settings as an input or output choice. When I lsusb with it not plugged in, I get:

user@e480:~$ sudo lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 006: ID 06cb:00a2 Synaptics, Inc. 
Bus 001 Device 004: ID 04f2:b604 Chicony Electronics Co., Ltd Integrated Camera (1280x720@30)
Bus 001 Device 014: ID 0bda:b023 Realtek Semiconductor Corp. Bluetooth Radio 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

and when I plug it in, I get:

user@e480:~$ sudo lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 006: ID 06cb:00a2 Synaptics, Inc. 
Bus 001 Device 004: ID 04f2:b604 Chicony Electronics Co., Ltd Integrated Camera (1280x720@30)
Bus 001 Device 014: ID 0bda:b023 Realtek Semiconductor Corp. Bluetooth Radio 
Bus 001 Device 016: ID 30be:0100 Schiit Audio I'm Fulla Schiit
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

so I know it's detected... Other than semi-regular apt updates, I haven't changed anything config-wise. It also isn't showing up in the pacmd list-sinks list.

user@e480:~$ pacmd list-sinks | grep -e 'name:' -e 'index:'
  * index: 0
    name: <alsa_output.usb-Ingenic_Semiconductor_CO.__LTD._HD_USB_Camera_Ucamera001-02.mono-fallback>
    index: 1
    name: <alsa_output.usb-Blue_Microphones_Yeti_Nano_8918B12148040506-00.analog-stereo>
    index: 2
    name: <alsa_output.pci-0000_00_1f.3.analog-stereo>

Where should I look next to find out why it's not a choice?