I got GalCiv3 while it was free on Epic Games this week. Seems like a fun game but the UI frequently locks up. The game still responds to input (I can tell from the sounds as well as from what a friend tells me when we're playing multiplayer) but the UI totally stops updating. Sometimes it will go completely black after a bit but not always.
I'm running it on a surface pro 8 with an i7 processor and 16 GB of RAM. I've tried turning the graphics settings all the way down, running in windowed mode (as suggested in the official troubleshooting guide), and verifying the install, turning the scaling to 100% (in Window's System > Display settings) completely uninstalling and reinstalling. None of it seems to make a difference.
I have tried both with and without my external monitor connected. It seems to happen less often when running without the external monitor but not so much less often as to make it tolerable.
Any suggestions for how to fix it? It sense like a really fun game but the frequency of this makes the game almost unplayable.