IMO the problem is more than dirt. Mine has a distinct click when the Latch Un-locks. I was able to get it to release but then it was not very repeatable at all. I had to use the square corner of my wooden work beck to keep working the release and I may have gotten it to the point now where it is somewhat repeatable. Still have the click though. Neither of my other 3 have the click or the issue. The problem appears to have been only on my Clip Blade. If the Stag was not exceptional on the problem knife , it would have gone back!!!!! Added : My clip blade is not the Satin version . Maybe they discovered the problem at GEC and corrected it and then the corrected blades were the satin versions. That is one way to keep track of them in their shop.
Harry