We have witnessed the same issue with nodes on 1.10.x releases.
Nodes on linux machines (both CentOS and Debian) at times seem unable to communicate with joined network even though they appear ‘online’ in ZT central
Similar issue also reported by others : Zero tier 1.10.1 machines are getting disconnected from the zerotier - Community Support / Linux - ZeroTier Discussions
When it happens restarting ‘zerotier-one’ service on the node seems to restore connectivity.
We hope issue is resolved in subsequent releases.