I opened VE in Firefox 38 and did some editing. Then I tried to switch to the wikicode editor, opening the "cancel/discard changes/keep changes" confirmation dialogue. While the dialogue was open I lost Internet connection. After I hit "keep changes", VE began to saturate one CPU core. (I only lost Internet connectivity but was still connected to local network. From another similar experience, I don't think it makes a difference, though. I think the same thing happened with the link tool dialogue box: opening dialogue box, loosing internet connection, initiating a search for a wikilink target by typing into the link target search field.)

Then Firefox asked confirmation to leave the page because of unsaved form data and I denied. Now VE got stuck completely and I had to reload the page, loosing all changes.