This problem started about a week ago with 1 of my 15 Wireless Lan Controllers. There are no errors and the controller just reboots itself. I have monitored it this morning and it has restarted no less than 5 times in an hour. Does anyone have any ideas why this would randomly start happening. It comes back with no problems or errors. Stays up for about 15 minutes and goes back down. I have checked all the connections, but site is 2.5 hours away so I want to make sure I have a decent idea of a fix before we drive there. We have had these in for about 4 years without any issues. Never had an issue with this. The software version is 22.214.171.124.
Have you seen anything in sysinfo, such as high temp?
The most probable, if nothing changes in the setup, is hardware failure, and the most probable in that is either the fan or the power supply.
The fan status can be seen in sysinfo, the power supply can be changed for another one (since you have 14 other that are certainly working properly).
These are the most probable causes in my opinion.