Wireless Access

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"Rebooting AP due to topology change: hierarchy to flat"



I have a network fo 54 AP-207 running for more than two years now


in the past few days we have suffered from the several reboots of them all at the same time with no known reason for that


today i checked the logs of several units and found out the below error , can anyone please help me identify the cause of that and how to solve it ?


Nov 20 10:12:11  nanny[3385]: <303022> <WARN> |AP IT: |  Reboot Reason: AP rebooted Wed Nov 20 10:09:00 UTC 2019; System cmd at uptime 1D 17H 16M 7S: Rebooting AP due to topology change: hierarchy to flat 

the whole log is attached


Thanks in advance


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