Hello,
Since I am unable to replicate this, can you please try the following?
Next time you reboot the device and it does not reconnect, could you please check if it reconnects after restarting ZeroTier:
zerotier-cli info
/etc/init.d/zerotier restart
If it does not help, please try:
uci show zerotier | grep secret
Then, if its zerotier.1.secret, do:
uci del zerotier.1.secret
uci commit
/etc/init.d/zerotier restart
#wait 2min
zerotier-cli info
Does it connect?
EDIT: While there is no newer ZeroTier version available on Teltonika devices currently, you could try to update it yourself. There was a topic about it here.
Kind Regards,