I've been with an issue over the last 2 months with some random users complaining that they get attacked by the Sentry from afar (500mts) even out of the outpost range even when they are not hostile (Red aim in the top right of the screen) and I even experienced it myself a few times in the last day. The only solution was the daily restart. Well I found the root cause this plugin!!!

After you kill a zombie near of a safe zone, and then you get killed or simple attacked by the safe zone you are permantent hostile 

I will stop the plugin for a while

Thanks for letting me know, should be fixed now.