its very likely your cables. That particular LG is really picky, too. If you have an OSD option to turn off power save or deep sleep that will help too.
What you must understand is that the kvm establishes one long signal corridor. It doesn’t recondition the signal.
So cable 1 + cable 2 may very well be below the cable standard. Historically this hasn’t been much of a problem but I guess the quality of copper cabling now is just awful.
Check out the kvm faq thread here, and/or pick up some FIBBR brand fiber optic displayport cables (6.56f), and that’ll probably fix you up.
this is the firmware update you are referring to? There was a botched one that came out for about 6 months then this oone came later.
Note it says updated 9**/2021** which seems weird for a 10 series card wink wink nudge nudge