Newly install Nextcloud chokes on first sync. File lock errors in logs

Returned to NC after an absence.
NC23, mac client 3.4.2
Docker installation
MariaDB
connecting an existing directory
localuser/share to nextcloud/share
About 1.4GB
Goes fairly quickly then just dies and getting file lock errors in the logs:
{“reqId”:“6qyTeyht4pYMVJd18cFQ”,“level”:3,“time”:“2022-02-02T19:39:08+00:00”,“remoteAddr”:“172.18.0.1”,“user”:“my_user”,“app”:“no app in context”,“method”:“POST”,“url”:"/remote.php/dav/bulk",“message”:"“Games/WinVICE-2.1/petcat.exe” is locked",“userAgent”:“Mozilla/5.0 (Macintosh) mirall/3.4.2git (build 9042) (Nextcloud, osx-20.6.0 ClientArchitecture: x86_64 OsArchitecture: x86_64)”,“version”:“23.0.0.10”}
{“reqId”:“K8fZXTS4Q0LcAQenvPbc”,“level”:3,“time”:“2022-02-02T19:39:08+00:00”,“remoteAddr”:“172.18.0.1”,“user”:“my_user”,“app”:“no app in context”,“method”:“POST”,“url”:"/remote.php/dav/bulk",“message”:"“Games/WinVICE-2.1/C64DTV/kernal” is locked",“userAgent”:“Mozilla/5.0 (Macintosh) mirall/3.4.2git (build 9042) (Nextcloud, osx-20.6.0 ClientArchitecture: x86_64 OsArchitecture: x86_64)”,“version”:“23.0.0.10”}

etc…