ownCloud ignore my MP4 and .rar files on sync

I am having issues with my ownCloud syncing mp4's and rar files sometimes I get an error saying can't sync mp4 and rar files. Sometimes the client application ignores them as well as sometimes it displays that the files are locked.
Error from client:

Server info:

Server: Localhost via UNIX socket
Server type: MariaDB
Server version: 10.1.24-MariaDB-cll-lve - MariaDB Server
Protocol version: 10
User: teamhusk@localhost
Server charset: UTF-8 Unicode (utf8)

Database client version: libmysql - 5.1.73
PHP extension: mysqliDocumentation curlDocumentation mbstringDocumentation
PHP version: 5.6.30

version: 10.0.3.
Client: V2.3.4 build 8624

I did the following search https://central.owncloud.org/search?q=file%20is%20locked scanned through the found threads and found https://central.owncloud.org/t/file-is-locked-how-to-unlock/985 which might help.

I checked and everything seems to be fine there I got a new error just now:


Seems to me that your remote server has some performance issues and takes too long to respond. Might worth to do some performance tweaks on PHP/MySQL/Operating System level.

@edlaika Ping? Did you find anything out?