[Plugin: All-in-One Event Calendar] multiple Google ICS imports fail

Hi,

I have a problem with the plugin. I am creating a WP Homepage for a driving school. I want to use the calender plugin to show the upcoming theory classes. But there is a displaying problem.

I have created for each theory unit a google calender. As there are 14 units I have created 14 google calenders. In All-in-One Event Calendar settings I have created 14 categories. Then I have added the 14 ICS feeds and assigned each to one category.

To administrate the google calenders on my PC I am using Thunderbird with Lightning Calender.

In general it works fine.

But I have recognised, that sometimes events are missing in Event Calendar when I open the page or when i reload the Event calendar missing Events show up and others disappear. If I reload again others disappear.

Currently there are only two events per calendar, but I would like to know how this can be fixed, otherwise I would have to search another solution, before I go live with the project.

Thanks a lot.

https://www.ads-software.com/extend/plugins/all-in-one-event-calendar/