Bugs on winter event 2015 [needed devs resp]

Hello,
I dunno if this a bugs, glitch, or just problem on my phone, here's the list ive found so far :
1. With 469 ping (good connection) i can't enter the portal event. Each time i press the enter button, it dont respon anymore. Need to restart the app to fix it.
2. Stun from mobs is spammable. Im a event runner lvl 3 mages with best gear. Im doin run easily but in precious moment, 5 mobs makes me killed. Not lag but stun. Their stun me from 100% HP to 0% without makes me doin any movement.
3. Late respon from mobs. When im going to them, I shoot fireball. But it needs 2-4 secs for them to attack me back also not receive damage from my fireball.
4. Fantasma arcane ability always showing green shield. Red, blue and yellow shield not appear anymore.

Need clarification, thanks.