I was playing as the Advent Loyalists and had just finished beating a vasari loyalist fleet over one of there planets. At the end of the battle my titan leveled up and I got the repossession ability. After waiting a little bit for my anti-matter to regenerate enough to use it I noticed that the anti-matter wasn't regenerating at all. When I checked my Titan it said that passive regeneration was disabled. I've waited around for several minutes and the effect hasn't gone away. Is there an easy way to fix this?
Your titan got hit by a Vasari missile platform. With research, one of the Phase Missile Platform's special abilities disables passive regeneration on the target for several minutes. It will go away eventually, so long as your titan doesn't get hit by more defense platforms.