krnl386, 8 months ago I had a similar issue as you, and switching/reseating DP cables solved it for me. This is the switch I am using. Also note my monitors can only do 4K@60Hz.
I had a similar issue as you, and switching/reseating DP cables solved it for me. This is the switch I am using.
Also note my monitors can only do 4K@60Hz.