Could also be out of memory errors which are also tricky. Linux's OoM killer just picks something at random and terminates it. If you're lucky is something your

Could also be out of memory errors which are also tricky. Linux's OoM killer just picks something at random and terminates it. If you're lucky is something your app doesn't need but if you're unlucky and you're not paying close attention to syslogs, you're in for a fun time trying to figure out why your app just stopped for no logged reason.