Default [Q] WhatsApp stops showing notifications after few days?(CyanogenMod)

Hi I an using a rooted htc one running cyanogenmod.

My whatsapp stops showing notification after a few days and the notifications do not appear until i reopen the app. Then I will see many unread messages. After opening the app, notifications start showing up again for a few days.

I am also running greenify and have checked that I have not hibernated the app.