It's good that this is being mentioned, I've had this problem before, so what I did was that I reinstalled the entire game and reinstalled both TSLRCM and M4-78, after that, I didn't have this problem anymore. I'm assuming that it could be a conflict with a mod, because before I reinstalled KOTOR 2, I had a lot of mods, and as of now, I am currently i'm using only the assorted mandalorian armor mod and I had no problems so far to the end after having reinstalled the game.