Update:
don’t know what was the problem, but it’s working again
- deleted all items in Inbox (nodes which were not identified - so all)
- deleted Z-Wave Controller in things
- upgraded to RC1
- unpowered some of my fibaro plugs, as they send very oft power reports (intended for a research project) → idea was to reduce z-wave traffic
- included z-wave controller
- started detection
→ about 95 % of my nodes are working again, remaining ones will hopefully work tomorrow morning (battery powered nodes)