One problem that comes to mind has occured on 3 of my orders. Keep in mind..."3" out of thousands but still a repeat occurence. One was even instrumental in the development of my "Stanaback Special" which I have documented before.
Model #23-4 1/2" in stainless steel has developed a hairline crack in the top false edge, about half way up. One case was noticed in the main room of the Randall shop. This one was re-ground by Jeff McCartney and became a 4" Stanaback Special in the early-mid 1980's. One was spotted by yours truly, after I had taken delivery but before I sold the knife. A new replacement knife was made. One was noticed by a customer shortly after he received delivery. The knife was sent back to me and a new replacement was made.
That's the extent of "issues" of this type that I have had first hand knowledge of.
Best, Capt. Chris