Upgrading the network and strangely enough Sonarr stopped working on both networks. Radarr and others work fine.
shifted primary server from Apple Time Capsule to Linksys Velop WHE01 (time capsule switch to bridge mode.)
Snynology DS app updated
Unclear why all the services/apps are working as normal except Sonarr which stopped on both servers. If ip or dns changes happened etc, I would expect Radarr to have the same problems, for example, as Sonarr.