Owncloud 9.1.5 (EPEL) on CentOS 7-current, using PHP 7.1.6 (from the remi-safe repos) with MySQL.
Users are trying to upload a large amount of data. Uploads abort with the above message after varying periods of time and data uploaded.
I don't see any recent posts in the Google referencing this message, so I assume I have done something wrong rather than having discovered a fault in Owncloud, so I don't think submitting a bug report is necessary yet.
Does anyone have any ideas what I'm doing wrong?