@buckgen5 and Bugout Bill,
I find this to be the case with pretty much all folding knives. Sand, mud, etc.. if they find a way between any lock surface, it'll cause a slip or jam. At minimum, debris caught up in the washers/bearings can slow the deployment and not allow the lockface to engage properly. I could be mistaken, but your expectations seem unfairly high. I like flow through constructions specifically because it's easier to clean through with running water or a can of air.
Maybe your solution to this would be a fixed blade.