I'm using this MB Pro:
Apple 13-inch MacBook Pro - Space Gray 2.3GHz dual-core Intel Core i5 processor, Turbo Boost up to 3.6GHz 16GB 2133MHz LPDDR3 memory 256GB PCIe-based SSD Intel Iris Graphics 640 Two Thunderbolt 3 ports Force Touch trackpad
I've been using the LG-24UD58 as main external monitor connected through an HDMI cable + the Apple USB-C Digital AV Multiport Adapter, and I never had any problem.
Now I bought the LG-38WK95C, and I'm using it connected through USB-C along with the LG-24UD58 connected as before.
The problem is that now the LG-24UD58 sometimes glitches, or shows white noise, or sometimes all black with just the pointer, etc.. Most of the times it recovers in a couple of seconds, but it's really annoying.
Do you perhaps know what it could be and how this could be addressed?
UPDATE: the laptop is not closed, so 3 displays.