Ahhh, that explains a lot. Didn't attribute it to the PA tho! Couldn't understand why that sentry bot captain suddenly turned on me
Did you install the Targeting HUD in your X-01 Helmet? I've heard that causes issues, but I've never heard of or experienced regular X-01 armor giving people grief.
The one that highlights enemies red. Apparently there's a weird bug with it where it can be considered a hostile effect on NPCs because of how it works. I know there's reported bugs of the Targeting HUD causing the boss of the Reunions quest to aggro immediately instead of engaging in dialog first.
I use the targeting HUD, never had this problem.
I've heard it's super-easy to get the USS Constitution 'bots to go aggro on the player though.
It can happen with or without the targeting hud for PA, regardless of PA variant. Though it seems random could be some improper code that accidentally fires making friendlies hostile to player.
I've had that mod on my X-01 since I got it and didn't have issues like OP. Although there were times where neutral/friendly NPC names would be red in VATS.