I've never that had the problem with any of my Sigs, but I recall reading of a few other folks having that happen.
The only problem I've ever had with my 239 is that it doesn't like the CCI Blazer ammo. About 1 out of every 50 rounds doesn't ignite on the first hammer strike. I haven't had the problem with other ammo, so my solution is to not use any more Blazer.
My confidence is low for reliability with the 239 right now till I find out WHY the pin broke. I had'nt even put 500 rounds thru it when it broke.
Let me know if ya find the reason.
Stay Safe !!!