Webdav SSL hangs

When i installed Nextcloud 13.1 webdav ssl works find.

One our later webdav ssl was very slow and now it is not connectable anymore.

i found the following entry in the Apache log. If i change the directory rights it sets automatic back.
i am not sure if there any dependence between the webdav problem und the log.

[core:crit] (13)Permission denied: AH00529: /home/httpd/vhosts/herz-consulting-winterthur.ch/cloud1.herz-consulting-winterthur.ch/data/.htaccess pcfg_openfile: unable to check htaccess file, ensure it is readable and that ‘/home/httpd/vhosts/herz-consulting-winterthur.ch/cloud1.herz-consulting-winterthur.ch/data/’ is executable

dos anyone has an idea how to solve the problem?