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There is a bug report on gentoo for XScreensaver: https://bugs.gentoo.org/show_bug.cgi?id=493976 XScreensaver crashes for the reporter after an hour or so of locking screen, thus unlocking the screen without notification.
Closing as INSUFFICIENTDATA. Please reproduce this on Fedora. It may be gentoo specific. Also, if xscreensaver crashes, abrt will detect it. Anyway - I have no idea how to reproduce this - even if xscreensaver crashes for me, I have no means to check if the issue is the same as the "reporter" sees.