We have faced issue with Switches model WS-C4506 got hangup and unable to loging through console as reported by our Customer but we are not getting any error logs/specific messages for this event happened.
Attaching here show tech-support for these two switches, confirm if there is some finding's.
The show tech is taken after the reload of the box. Hence it may not be of much use to find the issue occurred. I would say try to pull the syslogs from the server 10.249.29.249 since you are logging to it.
It may give us some information on what would have happened at that time. If nothing else is seen, please proactively monitor the CPU utilization and Memory utilization of the box to ensure nothing unusual.
sh proc cpu history
sh proc mem
Again it can be a one time issue, but if it repeats you can have a laptop connected to the console of the box so that when this happens you may be able to see what happened on the box.
Hope this helps you and please rate my post if it is useful.
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