Upgrading Pylon on h1digivideo[4,5,6] has fixed the problem whereby camera processes continued to open files until they eventually reached the OS num_files limit and the camera crashed (new files were opened each time connection to the camera was restored, old files were not cleaned up).
Since the upgrade Tuesday 24 June 2025 the number of files open per process has remained static. Details in FRS, this ticket has been closed.