Went to the range yesterday with my year old p320 xfive serial ending in 574 and had a kaboom. Just like you guys are describing. The slide was “sticky” and occasionally had to force it shut. Definitely fired out of battery. It fused the shell in the chamber and blew the case head completely off, taking the extractor and safety plunger/spring with it. Luckily No one was hurt. I’m a New Hampshire resident, so I dropped the gun off to Sig. I’ll be curious to see what the factory has to say as the pro shop staff was hinting towards being “ammo related”. Very disappointed with the company lately. My p365 has had issues also, but has since been resolved.