I have struggled with this missing UI for 2+ weeks. I cannot solve it. My research led me to the answer of "not messing with any UI elements during and a few seconds after setting UI to normal" -however, the problem persists. The UI dissappears randomly in games (pics below). Also, it occurs more often in high graphic settings.
The map starts up and immediately sets the UI to fullscreen without any changes to UI. However, there are UI elements that are changed within the map UI module directly.
During fullscreen mode, there are a few camera view changes and game speed changes but there are no UI actions. Two seconds after the UI is set back to normal, I hade a terrain section and then I hide UI buttons.
Edit: i keep forgetting to add; map's name is desert strike azure