Thank you.
Had many of the same issues, flickering, black monitor screens, and finally the LG monitor just went completely dead and couldn't be resuscitated. I had called Apple several times, pretty much from Day 1 about the issues and when the monitor went dead they insisted that I bring it into the Apple store even though I had the monitor less than 14 days. At the Apple store they were helpful enough, tested the monitor and got the same black screen with their own MacBook Pro. They replaced the LG 5K and updated my software. Tried all sorts of things to foul the new monitor, unplugging it, replugging it, changing monitor settings, shutting the computer down with the monitor attached and not attached and it ran fine.
Took the new LG monitor home and in fact, it ran fine for the next 4 hours. But by the next morning, the poltergeists had returned, and the monitor awoke with an *orange* background. Restarting the computer and unplugging the monitor seemed to bring it back to the functional level of the original monitor -- random flickering, black screens etc. Then I came across your post.
I have on my desk a trash can MacPro, a Thunderbolt monitor, the MacBook Pro, the LG 5K display -- and an AirPort Time Capsule. It's pretty crowded. I was wondering how I could shield the LG monitor from the router -- and remembered the anti-static bag that the LG monitor was shipped in. I now have it loosely tacked to the back of the monitor with masking tape.
Now 24 hours and everything has been working fine. Not a permanent solution, but it seems to work.
I wonder what Steve Jobs would say?