Sound Card Is No Longer Found Or Recognized After A System Sleep/Wake

[JohnMarzulli]

Distribution (run cat /etc/os-release):

NAME="Pop!_OS"
VERSION="19.04"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Pop!_OS 19.04"
VERSION_ID="19.04"
HOME_URL="https://system76.com/pop"
SUPPORT_URL="http://support.system76.com"
BUG_REPORT_URL="https://github.com/pop-os/pop/issues"
PRIVACY_POLICY_URL="https://system76.com/privacy"
VERSION_CODENAME=disco
UBUNTU_CODENAME=disco

Related Application and/or Package Version (run apt policy $PACKAGE NAME):
Sound drivers/pulseaudio
System76 Power extension - 19.04

pulseaudio:
  Installed: 1:12.2-2ubuntu3
  Candidate: 1:12.2-2ubuntu3
  Version table:
 *** 1:12.2-2ubuntu3 500
        500 http://us.archive.ubuntu.com/ubuntu disco/main amd64 Packages
        100 /var/lib/dpkg/status

Issue/Bug Description:
Environment/Hardware

• Intel 9900k + SoundBlasterX G6 (External USB soundcard)

Steps to reproduce (if you know):

1. Open Settings, navigate to Sound
2. Scroll to "Output"
3. Click the drop down widget to select the Output Device
4. Observe that two SoundBlasterX options exist.
5. Test the sound, observe sounds work.
6. Close the Settings app.
7. Click the power icon "System76 Power" extension
8. Choose the crescent moon icon to place the system to sleep.
9. Wait 30 seconds.
10. Wake the system.
11. Open the Setting app
12. Navigation to sounds, and "Output"
13. Click the output chooser widget.
14. Observe that "Sound Blaster" is no longer an option.

Expected behavior:
Sound Blaster audio should remain as the audio output, audio should continue to work after waking.

Other Notes:
An HDMI monitor output remains an option for me.

Restarting pulseaudio does not appear to be effecting in restoring audio.

pulseaudio --kill; pulseaudio --start

Only a reboot appears to restore audio, and then the output needs to be reselected.