For awhile now there have been a few reports about friendly Tribe and Nations npc's (Nogg/Ents/Guardians etc) suddenly starting to attack players who have not harmed them in any way previously.

This has been put down to lag before (accidentally hitting a friendly npc in combat, when the npc or the player are not where they think they are due to rubber banding or desync issues)

But, i've now personally seen and verified that this problem exists - where all, some or just one ToN npc suddenly turns hostile without any combat having taken place.

Is it replicable? Not sure, it seems to be an entirely random event.