Munawar, currently our assumption is that some cron tasks may cause this issue if new files are generated every 5 minutes. Or perhaps, the issue occurs because of a plugin. To assist you in the best way please give us more details. Could you specify what folders contain new created files, for instance: ow_pluginfiles folder, ow_userfiles folder or another folder. Also, provide us the list of the created files' names. You can find out this information using FTP or SSH access.