APs disassociate from the Controller

A few times a week, I get an alert saying that an AP or list of APs have disassociated from the Controller.  This is the message I get:

Virtual Domain: ROOT-DOMAIN

"PI has detected one or more alarms of category AP and severity Critical in Virtual Domain ROOT-DOMAIN for the following items:

1. Message: 802.11b/g/n interface of AP RC302 is down: Controller ..."

I am using the following AP:
AP Type:              CAPWAP
AP Model:      AIR-LAP1142N-A-K9
IOS Version:      15.2(4)JB6$

The Controller is a Cisco 5500 series running 7.6.130

After about 7 minutes or so they reassociate.  What could be causing this?
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Craig BeckCommented:
How are the APs connected?  Are they on the same LAN in local mode, or are they at a remote site?

If they are remote, are they in FlexConnect mode, and what is the latency across the WAN between AP and WLC?
GubbioAuthor Commented:
They are all on the same LAN in local mode.  Some are in FlexConnect mode.  Pings are between 1 and 5ms when the APs in question are associated.
Craig BeckCommented:
What about pings when the APs disconnect?

Have you done any debugging at the WLC or APs?
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GubbioAuthor Commented:
Disassociated APs have 100% packet loss.  I have not done any debugging.
Craig BeckCommented:
Ok, I'd guess that the APs are rebooting.  Are there any APs which are particularly prone to disconnecting?  I'd look at monitoring those APs and maybe check the switch where affected APs are connected to see if PoE is the cause.

What about the switch where disconnected APs are connected to?  Have you verified that the switches are still up?
GubbioAuthor Commented:
I took another look today and a fair amount of the APs did not reassociate on their own.  The switches they are connected to are still up.

I'm on a campus with multiple buildings.  How likely is it that several random switches suddenly started having PoE issues?
Craig BeckCommented:
It could be more likely than you think.

Can you go to one of the switches where APs disconnect and check the PoE status?
Giovanni di MarzioFreelance Cisco WiFi ExpertCommented:
PoE can be the problem, but also the AP can has some physical or software problem.
Check the log directly on the AP and, if you can, configure the syslog for the APs with this command:

(CISCOWLC)>config ap syslog host specific AP_NAME IP_SYSLOG_SERVER

you can also configure level and facility:
config ap logging syslog level
config ap logging syslog facility

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Craig BeckCommented:
So what was the answer to this?  Was it PoE?
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