Whenever I load a workshop game with custom models or a saved game with custom models, it seems to work the first time with only two or three having problems. But when I reload the same exact game a few minutes later, almost every model won't load. I've tried different workshop armies (so far limited to the 40k and Age of Sigmar sub themes), but it happens to all of them, leading me to think the problem is on my end.

Windows 10 Home
OS build: 18362.959