Good evening Julia and welcome back!
Thank you for reaching out to us.
We are sorry to hear about the issues you have bumped into while using recurring events. Yikes!
I would love to help you with this topic.
Based on your system information, it looks like your PHP max_execution_time = 0.
This might not be related, but you will want a value of at least 30, more commonly of 300 for that setting. Perhaps your web host can help you out with that ?
Secondly, on some websites, you might have to at least re-save your permalinks when you are faced with a 404 page not found message. The other thing is to fully empty and refresh your caching plugin’s cache (if you have one).
Could you please send me a copy of the latest version of your WordPress theme / child theme via a link to a .zip file link (stored Dropbox or Google Drive) so that I can run some tests on my end ? I recommend a private reply for that purpose.
Please ensure you are using the latest files as found on your actual website.
This way I will get access to any updates or customizations you might have made.
Hang in there!
Geoff B.