I picked up a 0560 from kershawguy not long ago, mostly because my 0550 was away for repairs for the second time. When I got the 0560 it was perfect. Solid, no flex, early lockup and strong detent. I stopped being a neurotic flipper after the 0550 destroyed my fingers and still had the problems I sent it in for. I got that 0550 back and it's fine, but kept the 0560 as my work knife anyway.
After less than two weeks of normal use, it's developed play. No excessive flipping, nothing ridiculous. I never took it apart, having decided to keep this as a straight user without fiddling. Now, blade play. Showed up a couple days ago, got worse. Looks like the corner of the lock bar is flaring out and losing contact area.
Yeah, I know I can send it in and all that. I probably will on Tuesday after a phone call. I'm bummed because I only used this as it should have been. No abuse, no play flipping, just regular cutting, and now the wiggle is audible.