I have a late 2016 MacBook Pro running the latest version of OS X Sierra 10.12.6

Ever since I got it, I've been having a problem connecting it to external displays.

Firstly, there is the 32" 4K Seiki Pro, connected via a USB-C cable. Most times when the Mac goes to sleep, the display does not come back until I put the computer back to sleep and wake it up, and then connect the cable when it's woken. Apple Support says this is a known bug but there is not currently a fix.

Then there is the LG UltraFine 5K 27" display for Mac, connected via the included Thunderbolt 3 cable. I got it today. It starts out flickery (the best way to describe it is what an old CRT monitor looks like). But then it looks like it's having a seizure, garbling up pictures and random colors and flickering super bad, and being completely chaotic. I'll try to attach a video to better explain. If the Seiki is connected as well, both monitors do the same thing as long as the LG is connected.

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Are you definitely using a Thunderbolt 3 cable between your MBP and the 5K monitor?

Incidentally, slightly jealous, I need to get one of those monitors but I'm worried my 2013 MBP might not be beefy enough to drive it smoothly.

You say you are using the cable that came with the display? Have you tried an "official" Apple cable? It is possible that your cable is defective.

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