CC2650EM-5XD-RD: when the zigbee end device leaves the network or try to rejoin the network?

Usually, ZED won’t do leave and rejoin.

I have kept my end devices within 5 meter radius of the coordinator,but still sometime it happens that -
1) end device leaves the network completely.
2) end device stops sending anything ,after restarting it rejoin the network.

Do you use sniffer to check what happens over the air?

device rejoin unexpected.rar

in the above sniffer log the device suddenly start rejoining the network,it was already in the network and sending data?

coordinator is sending mac ack to other devices but not sending to particular devices ..then what can be the issue on coordinator

Actually, I see coordinator also misses doing MAC to 0xD6C2 and 71CA data polling too.