I recall having this problem previously when I was using a Microsoft computer. Now I'm using Linux, and having same issue. If I fail to save every few minutes - if I get distracted while I'm adding new layout information, text, boxes, etc, and don't save -
When I do try to save, I get an Error Saving message. Previously I was told to try hitting the back button and removing the last action before reattempting to save. That has not worked so far.
If I need to save every 3 minutes I think the system should request/ remind me to do so, because in the creative mind I use while doing this type of stuff I simply don't remember. It was probably 20 minutes - not really a long time? It's a drag to have to redo everything.