Calendar app notifications

Hi all,
With the official calendar app, notifications are repeated in a persistent and annoying way: is there a way to avoid persistent repetitions? With the latest OS update to version 0.22 some calendar notifications are lost, especially when using other calendar apps and not the official one. How can this problem be avoided?

I removed the stock app and use only third part app: works for me, no more notifications.

You can also go to settings>accounts>/e/ account>account extra settings>/e/ account>settings and change sync from every 15 minutes to whatever you choose up to once a day.