Review on CKL Quad Monitor HDMI KVM Switch 4 Port 4K@30Hz with Cables - Extended and Mirrored Display Support for Windows, Linux, and Mac by Niko Knight

I tried to use this product for 3 monitors with 4 computers. At first the device worked, but after using it for more than 8 hours a day, it randomly went into one of the following states:1) "Mouse" and "Keyboard" did not work on the selected block more, but "hotkeys" for switching between computers still worked, this happened until you turned off the power to reset the device. 2) When switching from one computer to the second, the computer left behind no longer saw all the monitors as connected (it was supposed to emulate a monitor so that didn't happen), and when I switched back to it, ALL my monitors were open windows pointing to mine organized on multiple monitors ended up on 1 monitor, where I had to redo everything all over again. I worked with tech support, but no diagnostics or tests were available so I couldn't determine or explain why this was happening. I never offered to replace the device and as it got closer to my return I decided to return it rather than risk not being able to solve this problem.