App is not keeping up with IOS

This app, required for work email on my iPhone, crashed since the iOS was updated to 9, is apparently now fixed. Except that it still freezes, crashes, keeps email in the outbox randomly. I guess issues happen but if you are refocusing your business on enterprise server share shouldnt you have a better grip than this? Even when working the App is average.

Lokigirl about Work Connect for BES12, v1.0.21807.