I have the above error message and don’t find any error in the php and apache log (Debian Server):
Oops… there was a problem during the request. Maybe the server had a temporary issue, or maybe you requested a report with too much data. Please try again. If this error occurs repeatedly please contact your Matomo administrator for assistance.
It happens what ever the number of days asked and the archive Cron seems to work perfectly…
Do you have any idea ?