[Can't defeat Gemini Captain]

Be as nearby as possible. Worked for me even tho I played as IA. Also having a deprogrammed skytrooper with you helps a lot.

[Why does companions keep saying the same thing?]

Companions normally do repeat a few sentences over and over and over, when they're in combat. So, it most likely isn't a bug.

 

They are not in combat when they talk and Zenith and Iresso say excatly the same "Battleground teaches the best teachers" or something like that.

 

And I don't take Tharan with me anymore since I got tired with the only phrase he said.

[Why does companions keep saying the same thing?]

I'm playing as jedi consular right now and the majority of my crew has driven me nuts. Tharan keeps yelling that he's a pacifist, while Zenith and Iresso say exactly the same phrases.

 

Are those a common bug.

[Assault on Tython bug?]

I tried to enter as solo FP assault on Tython as imperial agent ( lvl 70) and sith warrior (lvl 55), but neither worked. Therefore I can't do Forged Alliance at all, which is annoying. I have read that it's a known bug and many can't enter that certain Flashpoint. I use the European server Darth Malgus.

 

EDIT: It doesn't work on smuggler class either.