[GAMEPLAY] Lissandra Ultimate Bug

The following has been happening almost every game I've played Lissandra within the past month:
While Lissandra is in Ultimate form (stasis - untargetable and invulnerable) she is still able to be killed, most likely when introduced to enemy Crowd Control effects.
I'm not sure if anyone else has noticed this or cared to report it, but over half the time I ult as Lissandra I find myself being killed before the duration of the ultimate has ended. Such bogus ;p