Keyboard does not work on slave computer KVM

Hi!

I have reinstalled the computer but still the keyboard from time to time stop working (type random character when pressing any key on keyboard on slave)i can take all from  immediately after reboot or sometimes it is working for some days before eventually stop working correctly.

If i restarts the service on both computers sometimes it start to work but usually just a short time like an hour or so.

Some times i can restart just on of the service on the slave or the master but it is not consistent the behavior when it work and when not.

When the slave writing random characters typing keystroke thru multiplicity. local keyboard works and if i use a remote control software like teamviewer the keyboard still works.

I only have one language installed on both computers and that is Swedish

Do you have any suggestion what the problem is?