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NX7500 Random APs rebooting with 'lost connectivity with controller after config update' errors

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Information

 
TitleNX7500 Random APs rebooting with 'lost connectivity with controller after config update' errors
Symptoms
Random APs rebooting with 'lost connectivity with controller after config update' errors regardless of AP models.

May 24 09:39:26 2019 startup 5.9.2.4-004R
May 24 09:39:04 2019 shutdown (graceful:Lost connectivity with controller after config update (user: connection-monitor))
May 24 08:37:42 2019 startup 5.9.2.4-004R
May 24 08:37:21 2019 shutdown (graceful:Lost connectivity with controller after config update (user: connection-monitor))
May 24 10:09:27 2019 startup 5.9.2.4-004R
May 24 06:09:06 2019 shutdown (graceful:Lost connectivity with controller after config update (user: connection-monitor))
May 24 05:20:47 2019 startup 5.9.2.4-004R
May 24 05:20:25 2019 shutdown (graceful:Lost connectivity with controller after config update (user: connection-monitor))
May 23 15:58:10 2019 startup 5.9.2.4-004R
May 23 15:57:49 2019 shutdown (graceful:Lost connectivity with controller after config update (user: connection-monitor))
May 23 14:50:00 2019 startup 5.9.2.4-004R
May 23 14:49:39 2019 shutdown (graceful:Lost connectivity with controller after config update (user: connection-monitor))
May 23 13:39:43 2019 startup 5.9.2.4-004R
May 23 13:39:22 2019 shutdown (graceful:Lost connectivity with controller after config update (user: connection-monitor))
Environment
WiNG 5.X
NX7500 controllers
Any AP models
Cause
Controller-managed rf-domains exceeded the limit for NX7500. The maximum limit for NX75XX model is 40.
Resolution
Reduce the number of controller-managed rf-domains below limit.
Additional notes

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