I noticed the loose gimbal, and the "snap" right away after getting them about 5 weeks ago. The loose connection started occurring about a week ago. Didn't worry about the loose gimbal until someone else posted about it. Maybe others with these problems should contact Hifiman customerservice@hifiman.com, so they can determine ther quatity control issues!
My gimbals are a little loose but just figured that's the way they are. Have not heard any snaps when listening, only if I push on them when taking the phones off and on my head. The cable connections seem very tight and secure (using the Oppo balanced cable).
Have just recently gotten these phones and so far they seem to be the best I've heard yet. Way better than the Audeze LCD-2-3-X which I have owned and gotten rid of. As a long-time, die-hard HD650 fan, I was starting to think nothing would ever top them. I noticed a ways back that somebody said these are HD650's on steroids. That claim has been made in the past concerning the LCD-2 and Audioquest Nighthawk. Both of those phones proved to be inferior to the 650 imho but I think the HEX may be the real deal. Don't want to overreact too soon but this is the most exciting new headphone purchase for me in years,