Losing work in Rise 360

Hi, please could you tell me why a popup comes up, either when I'm editing or when I've left the Rise tab open for a while, that tells me that I'm editing the course and asks me if I want to take control? When I click Take Control, it takes me back into the course but inevitably I have lost work, sometimes a little, sometimes a lot. This is happening with some regularity, twice this morning so far, and I have restarted, opened in an Incognito window and also made a new account. I don't know what else to try, I can't find a similar issue and I can't afford the time to be redoing work. Do you have any advice please?