Apache2 Blacklisting Address


im using OnlyOffice on my Nextcloud. As soon i open a File apache blocks the IP Address of my Firewall. Every Time i check the Status of apache after i opened the File, he says “Blacklisting address x.x.x.x: possible DoS attack.” After that i cant open any File anymore until i restart the apache again.

My Versions:
OnlyOffice 7.5.4
Community Document Server 0.1.12
Nextcloud 24.0.4