I have a xbee3 zigbee module as coordinator and 4 third-party end devices.
I have no problems at the beginning, sending unicast commands with 64-bits addresses, and receiving data (and NC=10).
After 2-3 days, end devices are removed from the network: xbee3 module does not recognize anymore 64-bit adrresses when I try to send unicast commands, and NC goes back to 14.
End devices poll rate is 1 minute but xbee3 module has SP=AF0 and SN=FFFF, which means that it would remove end device only after 2 months.
What could be the problem?