Just reviewed some of the logs and I see what you mean about the 10.0.0.29 device. I guess maybe it was a looping browser keeping connections? Odd though, I swear historically I've logged onto my Unraid for multiple devices and not necessarily always logged off yet this is the first time I've seen the error and not been able to access the GUI, even after a reboot.
Do you know if there is a mechanism in place that stops access after maybe too many logons? I'm just trying to suss out what alert in the syslog means. It almost seems like there is a ACL isolating access after too many incorrect retries.
Feb 14 21:58:15 Gandi nginx: 2019/02/14 21:58:15 [error] 7995#7995: *4 limiting requests, excess: 20.393 by zone "authlimit", client: 10.0.0.29, server: , request: "POST /plugins/fix.common.problems/include/fixExec.php HTTP/2.0", host: "REMOVED.unraid.net", referrer: "https://hash.unraid.net/Settings/FixProblems"
Nevertheless thanks for your help again.