I’m joining this conversation pretty late, so please forgive me if it is considered to be already solved.
The specific group that had the issue is this door, which somehow came to have an edge extending out a vast distance:
Since that is where the model’s view was centered when I cleaned up the errant edge, I assume it was what you were working on when things went sideways. I don’t know what you might have done to cause this issue (or to trigger a bug that caused the issue).
On a completely different note, which I hope you will take as constructive criticism, your model is bogged down by some “entourage” entities that have vast numbers of edges and faces. For example, this sofa alone accounts for almost a third of the total edges in the model (108502 of 375801! I turned on View->HIdden Geometry so you can see all those tiny edges).
There are also various other items of furniture with large numbers of edges. I don’t know whether you imported these from another source or created them your self using some subdivision or similar triangulation technique, but you will find that your model is much easier to work with if you defer placing such detailed items until you are finished with the rest. You can, for example, use simpler proxy components to get the overall arrangement and then swap them for the detailed versions at the end.