Sona needs to be perma-banned from ARAM
It is just unfair. she has one of, if not the most consist high win-rates of all champions. She basically negates one of the biggest combat restrictions of ARAM (cant back to heal). Soraka has at least a trade off where she has to use her own health + mana and has to choose between higher damage or better sustain (defense). Sona gets both with her team wide shield and an escape on her E in case it fails somehow, all of which are more or less spamable with her innate 40% cdr. Normally she is gated by mana costs, but ARAM covers that with the increased mana regen.
And before some of you start complaining that it is ARAM, "All Random" is in the name, let me remind you that it is not "All Random". If it was, I could possibly play any champion in the game. But that is not how it works, I have to use only my own champion pool + the FotW pool. So no it is not at all "All Random".

and
. But because she is able to work effectively from a defensive standpoint, she is much more difficult to play against. You also can dodge Zigg's abilities. Only Sona's R is dodgable, though it can be difficult being a wide AOE and quick cast time.