I am currently using a 5508 Cisco WLC with software version 126.96.36.199. It has been running smoothly for the past 1.5 years, but have recently discovered that the WLC will randomly restarts itself. I know this because I have seen the disruptions in our wireless network, as well as seen the Uptime counter reset itself. I have tried looking at the trap logs to see if there is any significant network traffic that may be causing this, but from what I can tell there is nothing out of the oridnary. The restarts happen randomly at random times. I have never seen a Cisco device behave this way, not a switch, a router or security appliance for that fact. Can anyone help me to figure out what may be causing the WLC to just reboot itself? Any help you can provide would be greatly appreciated. Thank you.
I would highly suggest you upgrade your WLC immediately to remedy this issue. There isn't much else to look at. Again, these older 6.0 versions have numerous problems with crashes in our 5500 series and I would not even attempt to resolve/troubleshoot this issue with your existing version 188.8.131.52. "If" you are having crash problems after the update, then definitely open a case with TAC as something else is clearly wrong.
Again, I would update to 184.108.40.206, clear msglogs/traplogs/crashlogs and continue to monitor.
Release notes are here, but I have anchored this link directly to the list of compatibility of APs and this release. Unless you are using some very old models, like 1000 series APs (see matrix), then you should have no issues moving to this latest 7.0 release.
This crash is related to several different bugs in the 220.127.116.11 and 18.104.22.168 releases. "Most" of them are resolved in 22.214.171.124, however I would suggest (if your infrastructure allows) moving to the latest 126.96.36.199 release for this WLC. I think you will find that the WLC will stabalize.
To completely confirm "which" one, we would need to see the "entire" output of the crash file. Here are some examples of bugs it is possible you are hitting.
Bottom line; there are "numerous" crashes that can be encountered on 5508s running those later 6.0 releases and I would suggest an upgrade. Upgrade to 188.8.131.52, clear all logs (traplogs, msglogs, and crashlogs) then monitor.