Emails from WCS saying that AP is down.Plz help

Hi Experts,
I am new to wireless and I am facing strange issue here. Hence need your help in order to resolve this.
Everyday I am getting the  E-Mails from WCS.
Error:
WCS has detected one or more alarms of category AP and severity Critical in Virtual Domain root
for the following items:
802.11a interface of AP AP-1140-1 is down: Controller 10.12.0.20
802.11b/g interface of AP AP-1140-1 is down: Controller 10.12.0.20 ( couple of times)
I would like to know what is causing this? and how do i need to troubleshoot this?
What errors and logs do I need to enable on controller?
I dont want the AP's to get disconnect very often as this will impact the users. Around 10-15 Aps getting disassociated everyday.
Thanks in advance.
Regards
Fari

check for how long it stays disconnected. Then go on WCS and try to look in the alarms to see if it mentions a reason for having left when it joins again ...
You can also check the message logs on the WLC itself.
Regards,
Nicolas

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