
I've filed the issue reports a few times, but it feels a bit hopeless. It is a really disappointing, frustrating issue. I've even had the SMC fail and had to reset it due to this issue, and it affects my work several times a month. 1: the remote distance is terrible it was to be directly.
When I switch inputs on my DisplayPort / HDMI display to view my PC desktop, it often crashes - Especially with the DP → HDMI setup/monitor, but also with the play DP cable (this is across two different test displays apart from the Ultrafine). Top tips to fix a HDMI fault: Check there isnt a loose connection on either the Source or Display end of the HDMI cable. I have had no issues like the others have claimed but a few issues with the design I will clarify. If the laptop goes to sleep, I cross my fingers that it won't break. Other times, opening the lid crashes things.
I close the MacBook lid to save a bit of performance since I only use the two desktop displays, but sometimes that crashes things. It helped a bit to stop using the $300 Belkin dock I bought from apple for the Ultrafine, so it is only serving the third display - but issues abound. I have had just terrible trouble with crashes as well on my brand new MacBook Pro this year, but connecting a LG Ultrafine and a Display Port (or HDMI via a DisplayPort → HDMI cable) display results in an unpredictable, crash-prone environment.