I've owned three sets of Ping irons G15, G, G400 with stock graphite shafts. I've had two break at the hosel and both were G15's without ferrules. Coincidence? 😕
I think what happens is when our swings get off (which for most of us high functioning hackers is quite often) we blame the clubs. So then we change clubs and things get better for awhile and we think it was the clubs. But, then things go south with the replacements and the cycle gets repeated.
The thing to remember is if we hit the now seemingly bad clubs good at one time it most likely isn't the club. We all know this of course, but look for reasons other than our high functioning hacker swings for the answer. 😉