due to high sickness levels, poor morale and the fact that they are only able to train 90 new cabin crew per month; which barely covers the number of crew going on maternity leave!
But have these levels increased at all recently? I very much doubt it. The cabin crew shortage is actually down to poor planning. They cannot train up quickly enough, because they have allowed levels to get too low before they started recruitment again.
They may have assumed the cabin crew would sign up to the new AMP, and sickness levels would go down. But that was a silly assumption.