Intermittent USB keyboard/mouse disconnects across multiple Windows PCs (HKS0402A1U/HKS202-E23)

Hi,

I'm trying to troubleshoot an intermittent USB issue with my HKS0402A1U/HKS202-E23 and am hoping someone might have some suggestions.

Hardware

• TESmart dual-monitor KVM - HKS0402A1U/HKS202-E23
• Logitech G915 X Lightspeed keyboard
• Logitech M720 mouse
• Logitech webcam (currently removed from testing)
• Windows 11 hosts
• I've had this same hardware configuration for 3 years- same NUC and same Lenovo work laptop.

Symptoms

The keyboard and mouse will intermittently disconnect from the active computer.

Typical behavior:

• Keyboard stops responding.
• Mouse also appears to disconnect.
• Windows often plays the USB disconnect sound.
• Sometimes they reconnect automatically after a few seconds.
• Sometimes they remain disconnected until I unplug and reconnect the USB cable between the computer and the KVM.
• On one computer, I occasionally had to reboot before they would reconnect.

Video output through the KVM has always continued working normally.

Troubleshooting performed

I've now reproduced this on three different Windows computers:

1. Intel NUC 11
2. HP Windows laptop
3. Lenovo work laptop

The behavior is similar on all three, although the severity varies.

To eliminate other variables, I simplified the setup as much as possible.

Current configuration:

• Mouse receiver connected directly to one of the KVM's HID ports.
• Keyboard connected directly to the KVM's generic USB port.
• Webcam completely removed from the KVM.
• No external USB hub in use.

Despite that simplified configuration, I still see intermittent USB disconnects.

Additional observations

• If the keyboard and mouse are connected directly to the computer (bypassing the KVM), they are stable.
• Bluetooth operation is also stable.

• The issue only appears when using the KVM's USB switching.

   

Question

Is this a known issue with this model?

Are there any recommended settings, firmware, USB compatibility notes, or diagnostic steps I should try?

I'm happy to provide additional information (Windows event logs, USBTreeView output, exact KVM model number, etc.) if that would be helpful.

Thanks!