[Old Thread] Unable to kill the architect

I had this problem killing my 3rd architect.  In all cases I used the Nomad to chase, switching weapons made no difference.  Glitchy darn thing.  To add more info; the third fight occurred on Elaanan.  I exited the game and loaded a auto save just before the fight, did not use the nomad, did not switch weapons and everything worked wonders.  However i do not feel comfortable with this - it will bug out again I am sure.