I am possibly an exception and certainly don't mean to be a downer, but mine continue at 20+ mo!! I'm pretty used to it and they do ebb and flow around stress or anticipation or something really on my mind....and we do a lot of sheet washing
Our family considers itself sweaty and I definitely got the sweat gene from my dad. It's mildly annoying sometimes, but I figure it's not a bad deal in the big picture!