we have a controller runiing 188.8.131.52, we have some AP's ( mainly 3502's) that keep disassociating from the controller, the AP's dont reboot or loss power, they just disassociate. there uptime does not change just the Controller Associated Time.
here is a message i got from the traps:
AP 'biochem-345-1-new', MAC: a0:cf:5b:3e:36:30 disassociated previously due to AP Reset. Uptime: 5 days, 13 h 13 m 24 s . Last reset reason: power loss.