The relationship editor lets you far more relationships than the server can actually handle. Then when you try to submit them, you get an error and you probably have to just start again, wasting all your time and effort. The user has no way of knowing (other than by finding out the hard way) that this will happen. Since we're not getting rid of the server timeouts, we really need to find a better way to handle this.
I would suggest that we at least prompt users to submit their work after so many relationships. A better implementation of that would be a "save and continue" button which would bring you back to the relationship editor with your edit note in tact.