Hi Storel, welcome to DoF.
The only time it can randomly switch you to the World Map is if somebody attacked you. How often did this happen so far?
I think what`s happening is the game seems to think you have an army (which you actually don`t have) and people keep on attacking that army.
If you can tell me your username and town name I can take a look at your town - this is a really odd new bug.