Spreedme app suddenly stopped working - service unavailable

I have a ubuntu 16.04 install of nextcloud 10.0.1 and a snap of the spreedme app installed. It has been working for the past two months. We used it on thursday, and then friday morning tried again and we get the following error

The server is temporarily unable to service your request due to maintenance downtime or capacity problems
Apache/2.4.18 (Ubuntu) Server at cloud.oursite.com Port 443

both on the /webrtc web link and also using the spreedme app

I have rebooted the server and still have the same issue. the server only has a couple of users on it at a time, so i know its not over capacity issues.

any help would be great.

to update this.

I have uninstalled the snap of spreedme
using sudo snap remove spreedme
and then reinstalled