Marshmallow update messing up notifications & do not disturb

[Katejokunen]

Hey..

The marshmallow update happened this week.. so far 2 major things not working as they used to:
- message notifications for viber and Whatsapp.. once the message comes the notification sound keeps beeping until I open the message.. how can I turn this off???
- do not disturb schedule seems to have stopped working. I can choose the duration of the DND but not schedule..

Please advise...