Zmninja issue with new install of zoneminder

[Meeko]

Details :
Old system zoneminder 1.34.22
New system zoneminder 1.36.1
Zmninja 1.6.008 android & is (tried both)

The issue.
I have a working cameras pc with centos 7 and zoneminder 1.34.22 but I was building a better box so rather than migrate I was going to do a fresh start. Centos 7.9.2009 clean minimal install and zoneminder 1.36.1

Cameras added and all good until I use zmninja again. Reconfigured or reinstalled it works fine for a while (couple of hours it seems) displays montage correctly but then only shows the camera names on the black footers. No camera displays!

I still have the other box (on a separate IP address) so Reconfigure zmninja and voila! All back as it should be. Reconfigure with the new ip address and all good for a while but then.loses.cameras again!

Where do I start looking? It's like when the cgi-bin address is wrong (current working setting is domain.com:4444/cgi-bin-zm, but app defaults to non-working /zm/cgi-bin)

Does that make any sense?

By the way the Web console keeps working fine so I believe it's a zmninja issue.

[asker]

Where do I start looking?

The logs files when this issue occurs. Both in zmNinja and ZM logs.
https://zmninja.readthedocs.io/en/lates ... ort-errors