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CC2530: When coordinator restarts it does not receive messages from router

Part Number: CC2530
Other Parts Discussed in Thread: Z-STACK

we have a zigbee network with one router and a coordinator.
It's a znp coordinator. The communication between the router and the coordinator works fine until coordinator is restarted.
we are using zstack 302.

  • corrdinator does not receive reports from the router for 10-12 minutes
  • write attribute commands are sent successfully but no ack is received from router during this period
  • if we reboot the router soon after restarting the coordinator, reports are received from router and also commands are delivered to the router immediately.

The sniffer logs are attached for reference.(P.nbr. 104 is approx when the coordinator was restarted)coordinator_no_rx_10min_on_start.psd

what is may be cause for this behavior?