Hi,
its highly discouraged to run ownCloud on a QNAP device for the reasons explained in https://central.owncloud.org/t/upgrade-to-9-1-on-qnap/3803/5 .
They currently can't provide up2date and bugfree system libraries and components. Please do the only sane thing and switch to a recent linux based distro and just use your QNAP as a storage backend via the external storage support app of ownCloud.
I'm closing here to avoid that the thread get further pushed possible unrelated posts / questions.