Cause:
HTC Sync Manager uses ADB to communicate with Android devices on the computer.
When running multiple ADB processes it will cause Phonecheck desktop to experience this issue.
Solution:
Open control panel
Uninstall HTC Sync Manager
Restart the computer.
Note: If this didn't resolve your issue you may want to continue below for additional troubleshooting.
Other Reasons
USB Debug isn't enabled
Not using OEM cables
Hub isn't providing proper power
Too many devices connected to the same power source or multiple power strips connected to each other.
Android device is not showing in Phonecheck or under device manager
How to Troubleshoot
Try switching to a known working cable from another station, also try a different port.
Try switching to a known working USB hub from another station.
Verify you have clean power to the computer and its hardware. If you have multiple power strips connected, try to eliminate them to only use 1 single strip.