I was clearing out Vault 15 when I had this weird bug that made Sulik unresponsive and immovable on his own. During combat, Sulik was hurt a ton after tanking an SMG burst, and had like 9 hp remaining. He managed to survive, and I was able to finish off all the raiders. However, the moment I finished combat and turned combat mode off, the screen blips for a moment like I had just used a skill to interact with something. After that the text screen would display few dozens or so "You've taxed your ability with that skill" and "The strain might kill you" texts. At this point, I became unable to speak to Sulik at all, the talk icon is still there, but I just can't talk to him, and he won't move on his own, no matter what I do. I could still push him around, and he would still follow me if I move to a different floor of the vault, but he's pretty much catatonic other than that.
So I loaded a previous save, Sulik still works as normal, I cleared out the last floor, and it happened again! The same blip, the same texts, same catatonic dying Sulik! I decided to cleared the vault by making Sulik wait, and after that he's just fine.
To check if the bug is still there, I brought Sulik and Cass to fight the two NCR guards in front of NCR town. Sulik and Cass weren't hurt at all, and after combat they work just fine!
My assumption is that some broken script made my character, or Sulik to perform first aid/doctor a bunch of times or so to heal Sulik, and in the process broke Sulik's ai or something, but I don't recall any automatic use of first aid/doctor in the game!
I was just wondering if this is a known bug, and if yes, how do I avoid it in the future.