[FIXED] AV Acess 4KSW41-KVM 4-port HDMI+USB KVM

[PDXpi]

I've purchased an AV Access 4KSW41-KVM 4-port HDMI+USB KVM switch to share my USB keyboard and mouse & my HDMI monitor between my Raspberry Pi 3 Model B+ & my Pine64 Rock64. 

The Raspberry Pi 3 Model B+ works as expected.
The Rock64, however, does not seem to recognize the USB devices (i.e., the keyboard & the mouse):

1. The LED inside the mouse illuminates but the desktop does not acknowledge any movement.
   
2. The USB keyboard is completely unrecognized:
   

• The Rock64 does not acknowledge any keystrokes. 
  
• Pressing the CapsLock and/or the NumLock does not cause either status light to illuminate.
  

Ideas? Suggestions?

TIA,
Eric P.
Portland, Oregon

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FWIW: The behavior of the Rock64 is the same regardless of which USB port I use to connect to the KVM switch - The USB 2.0 Host port or the USB 3.0 Host port.

TIA,
Eric P.
Portland, Oregon

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UPDATE:

TROUBLESHOOTING STEPS:
As an initial step to verify that the Rock64 was still healthy (i.e., not damaged)...

1. I removed the power input from the Rock64.
   
2. I transferred the keyboard and the mouse to the Rock64.
   
3. I inserted the power input into the Rock64.
   

FIRST RESULT: The keyboard and mouse functioned as expected.

And then...

1. I transferred the keyboard and the mouse to the KVM switch.
   
2. I inserted the KVM USB-connector into the Rock64.
   

SECOND RESULT: The keyboard and mouse functioned as expected for about 3 minutes. And then the keyboard and the mouse became completely unresponsive - the same as before.

TIA,
Eric P.
Portland, Oregon