No more notification sounds

Since a couple of days I lost my notification sounds when I have a new mail (Yahoo), no sound when receiving anything via wattsapp, skype and FB messenger. A reboot brings the notification back just for a very short period (1 notification). Vibration works and pop msg on lockscreen is ok.

My device is fully stock - not rooted CM 12.1-YOG4PAS91G...

Any suggestions?

Cheers,

Yves

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