My experience is the Juliet nosebridge is loosening more quickly than in the past. I too have had just one side go super loose after a handful of wearings...and I don't flex them by taking on and off over my head. Long term, with extreme loosening, I have found either dental floss or fine fishing line works to tighten a floppy nosepiece until a tightening can be done. And I keep seeing all over the place numbers on the tune up price.....its now $70. With TRACKABLE shipping, $75. Still cheaper if you care for your pieces to sell a loose nosebridge pair on eBay and purchase a new pair on eBay for essentially the same cost...unless the model is discontinued
I currently own around 23 pairs of X Metals, Some of the nose bridges are so tight and the flex is so minimal that the glasses actually hurt after awhile on my big head! I have pairs that are 10 years old and pairs that are less then a year old, since I don't wear them every day its difficult for me to say whether the old ones take longer to loosen then the new ones. This is an interesting post as I never considered how long before they loosen. If I had one pair and wore them ALL the time I could see this occuring at a different rate then others. Good post, and food for thought....