For what its worth, this issue seems to have been resolved after just updating to Version 16.3.6474 (Sep 22, 2017).
I uninstalled Version 16.3.6467 (Sep 15, 2017), rebooted the server, and installed the latest version.
* I know that this issue is very intermittent, and SM haven't claimed to have fixed the issue yet. Has anyone else seen the issue disappear since upgrading ? I haven't rebooted my server in months and only did so after reading another community post where someone mentioned rebooting the server fixed this issue on their end.