Well, I finally saw a YouTube review video for this machine, and the reviewer addressed this issue with the steamer wand "flying off" during steaming / frothing. She said it can happen if the wand is not properly cleaned after each use, resulting in the holes in the tip getting clogged.
So, I "pulled the trigger" and ordered this machine from Whole Latte Love. It arrived two days ago and, so far, I couldn't be happier with it! I have experienced zero problems with the ENA 4, including none with the steamer wand. It produces delicious espresso & lattes. I will post a detailed review here after I have spent a bit more time with it, but, so far, so good! Thanks!