It sounds like you have a bad radio module or perhaps it is heat sensitive such that when it gets warm, it stops working.
It's also possible that the power cube / injector is defective (not enough power, loses power when it warms up).
It might also be as simple as re-seating the radio module in the AP .... sometimes oxidization can accumulate on the contacts of the module (re-seating the module would help this too).
Unfortunately, the screws to get into the AP are "posted" Torx (a hollow socket with a pin, so a regular Torx driver can't be inserted).
The radio update modules come with the necessary tool, and they're also available in some "security" bit sets. I think it's a T-8 or T-10 size.
If you have an idea of how long it runs under normal conditions (check the log of power-up time versus when the clients start to drop), try putting the AP in the 'fridge to cool it off, then power it up and see how long it takes before the clients start dropping again.
Make sure it has adequate ventilation and air circulation around the AP so it doesn't overheat.
I have a very similar problem with devices losing association. My devices will be associated, 10 seconds later not be in the list, then be in the list but with no IP, then some will be in the list along with new associations. The list of associations seems to change every 10 seconds. The WAP has been working fine for the past 2 years and just started acting up today.
Transferring Crash file from standby:
Login to the Active WLC in HA.
(Cisco Controller) >transfer upload datatype crash
(Cisco Controller) >transfer upload filename <Desired filename>
(Cisco Controller) >transfer up...
This is the start of a display filter cross reference between Wireshark and OmniPeek.
The 1st installment is a table of advanced filters. More filters will be added as time allows.
It is a living doc, so check back for changes every so often
Please feel ...
I have created a Powershell script to automatically add a Wireless Guest User on Cisco WLCs. (tested on 2500 Series)
The script should be completely self explanatory.
Powershell SNMP Module (Install-Module -Name SNMP)
SNMP Write Access to...