I have been hearing and reading a lot lately about shoes coming apart more easily than they used to (same brand / model). I was surprised to hear that two brands that I have a lot of experience with (Keen hiking boots and Alpinestar motorcycle boots) have had adhesive quality issues on newer pairs when I've put many years and miles on the same models in the past. Is there a general trend across the industry in this area? Was some chemical banned that makes new adhesives used in shoe manufacturing less effective?