Today I updated to 4.1.0 rc1. Yesterday I updated to 4.0.1 Rc4. Both experimental. Since a previous update can’t remember which one I was having trouble after restart. Every time when I restarted homey zigbee was giving errors on AL sensors. I saw I red ! At every zigbee device. Restarting a second time use to solve this. Since the latest two updates this issue is solved at least in my case. No more zigbee issue’s after restart. Did got the ring of death again but that doesn’t bother me anymore since we have the back up functionality 
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