QNAP server has suddenly disappeared

Server Version#: V1.13,9.456 Installed 05 November 2018.
Player Version#: Web Client 3.69.1

QNAP TVS-873 firmware 4.3.6.0805 (updated yesterday - may have caused the problem??).

My QNAP server has been running successfully since installation.

Suddenly today, the only servers showing in the web interface are old PC servers, no longer in use.
This happens even when I run Plex directly from the QNAP QTS APPCenter interface,

The QNAP server is not displayed in the list of devices.

The web interface on all my PCs shows the same - just old PC servers, not the QNAP.
My Windows Phone is continuing to display the QNAP server and media.

How can I regain access to the QNAP server in the web client?

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