This has been suggested about half a dozen times in this thread. I don't mean to be curt, but it's really not helpful...at all. No one here with ZT issues is saying, "Whycome the foldy knife fold? They shuld make a foldy knife that dun fold!"
The issue is that some folks have paid for a premium product marketed as being super tough, and some of them are failing very light testing...not real world testing, mind you. I still find these failures academic and not earth-shaddering. Still, it's frustrating when you can buy a knife for half the price and it not slip off the lock.
The biggest issue I see is that when folks are sending their knives for warranty work, they are being returned without repair. I'm a bit miffed myself. I sent a 350 in that would fail with simple light pressure on the spine. I paid a few extra bucks to have the blade replaced. I figured the issue was with the grind on the blade, not the lock.
My 350 with new blade still will fail. So that either means I got another crappy grind on the blade or my liner lock is ground wrong which kinda sucks.
I have probably a dozen sub 2" fixed blades. I routinely carry a small karda (khukuri accessory knife) in my watch pocket. More days than not I have a Fiddleback Hiking Buddy on my hip. They are great small fixed blade knives, and very useful...but they don't make spending $140 on a knife, 10 bucks to ship it back, and another 30 to swap out the blade only to have it still fold when I don't want it to any easier to swallow.