Can't heal Sins in Colosseum

tolots

I have the problem that i can't interact with my Teams assassins that just came out of Stealth up to 20 seconds. I can select them, stand close to them, have no cc on me and still i can't buff , puri or heal them. After a endless while i can interact with them again unless they re enterd stealth.

I have no issues like this with Archer or DB's. I also dont have this issue outside of Colosseum.
Does any other Cleric have this problem and is there a workaround for it ?

thanks in advance