U3425WE KVM Thunderbolt 4 upstream port, external KVM switch issue

I connected my U3425WE Thunderbolt 4 upstream port to an external KVM switch (via USB-C to USB-A provided cable). Display video is connected via HDMI cable (to external KVM. It worked for a few days then it just stopped working to detect keyboard and mouse! Please let me know what I can do / check /reconfigure. I upgraded my monitor from U3417W. Thanks.