FN FNX
First, I found this thread but no fix, same exact symptom:
http:// http://fnforum.net/forums/fn-fnx/18285-pin-walking-out-not-serious-problem.html
Took my FNX-45 out today for some practice with no real issues. One FTE but I could tell it was a squib just by the weak sound it made. 676 rounds...