One of my projects I am working on is constantly refreshing and starting at Editor mode instead of Designer. Any ideas?

Heya all the good folks. I am experiencing a weird thing while working on one of my actual projects, and only on that particular one. During designing sessions the project designer site every now and then just decides to refresh. After loading it ends up at the editor mode and all of this is really annoying. Since it beginned it happened like hundred times, sometimes it occurs three or more time in the row. Has anyone of you experienced such behaviour? Even weirder is that it is happening only on one project, two others work just fine and I never deal with it there.

Thanks for any suggestions, it seems like a bug…
Cheers, Lego