That’s something I will try. My only gripe with that explanation is that I didn’t have the issue when my windows machine (which is exactly the same as it is now, except with Kubuntu) was using the same mouse, keyboard and setup.
I could try to put a mouse directly on my PC and keep my keyboard as is to see if I can trigger the issue. I might be on the brink of overcurrent and when the GPU is running hotter, it might trip the power drain.
My intuition is that since the nvidia driver on linux isn’t great, there might be an issue between the GPU and the HDMI connection to the monitor. And since the functionality of the KVM depends on the HDMI connection to the PC, if there is an issue, that might cause the issue. In the Xorg log, we can see that there is a hiccup with the GPU and it seems to be restarting the hdmi.
Still, I will try to lower the power consumption by reducing the GPU load, and any settings I can change on my monitor and see if that causes issues.