Now I had more time to analyze this, and are getting convinced that there have been a sunspot at 13. December. (laughs) - Just found this at uptime sensor in PRTG; but 'sh env all' shows all are OK.Sensor Status History (UPTIME)Status Date Time   Unk...

Not tested, but main concern is this one random reboot. Redundant power supply, which the one side are connected to UPS, and sh env all show all OK. Then I noticed the unusual high CPU usage, and wondered maybe it might had something to do with that.

Hey We got three C3750X with current Cisco suggested IOS version 15.2.4E10. All are affected by this bug. CPU stays around 30-50%, with 100% spikes.This got my attention as I was investigating an unexpected reboot for apparently no reason. Eirik