Zigbee re-connect issue

Hello DevZone,

I am developing battery powered Zigbee end device. Using nrf Connect SDK 2.6.0 on nrf52840 chip. 

I have issue that I am trying to solve. From time to time end device lose connection to the coordinator and I am restarting device to re-connect to the network with 

NVIC_SystemReset();. But after this reset device didn't reconnected. I watched in the debug mode what is my device is busy in Zboss_signal_handler and it's comes there only for SIGNAL_SLEEP. 
Maybe I missed something? 
NVIC_SystemReset(); - is this is a good option to reboot the device or should I use 
zb_bdb_reset_via_local_action(0); ?
 
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