I'm sort of having a similar issue with XIV freezing/not responding too. Everything was fine until about a week ago, now everyday, probably about every 20-30 seconds for maybe half a second, it'll freeze up/not respond, then be fine for another 20-30 seconds. Everything else runs fine, it's just XIV that does it. Sometimes on the taskbar, it'll act like XIV closed, but repop back up within that half second, or it'll bring all the other windows forward, like it closed itself out again. Again, only XIV is doing this and it started a week ago.

Someone said its a dx11 issue, but I can't seem to find anything on it.