Campaign duration and segment membership

Your software
My Mautic version is:v5.1.1
My PHP version is:8.1.29
My Database type and version is:10.5.25-MariaDB-ubu2004

Your problem
My problem is: I fill a segment with new customers who bought for the first time exactly 7 days ago. This segment is the contact source of my campaign. The campaign runs for 4 weeks. 4 emails every 7 days. Do the contacts have to be in the segment for the entire 4 weeks or is it enough at the beginning? And do any settings have to be made to only use it initially?

These errors are showing in the log:

Steps I have tried to fix the problem: