Fault with WS-24-400A?

[bigal488]

We deployed a new WS-24-400A a couple of days ago.
To start with we were seeing much better throughput than the tough switch it replaced.
However, yesterday I noticed the WebUI was refusing to load. A reboot failed (the switch did not come back on line), so a site visit was carried out this morning.
Pulling the power brought the switch back on but after a few minutes of operation CPU usage went up to 100% (and stayed there) and the gui was very slow to load.
Also the Total Throughput stats were reporting nearly 1Gbps of data through the switch - checking the devices connected to it they were all reporting 40-50Mbps.

I've upgraded to 1.4.6, defaulted the switch and manually re-entered the configuration. Same results - as soon as theres any traffic across one of the ports, the CPU jumps up to 100% and stays there even if all the cables are removed (obviously apart from a management link for me to use) and the webUi is slow and unresponsive.
Only a reboot restores a 'normal' CPU level.

The config is very basic - just a few VLANs and things like LAG, RTSP etc. all disabled.
I've attached a zipped copy of the config and screen grab showing the 100% CPU

Can you shed any light on what the problem is?

[Eric Stern]

Is there anything in the log?

[bigal488]

no - I had a look and there was nothing that suggested any issues in the log.
I'm back from our NOC and tried to reboot the switch remotely but its not come back online again.
I managed to screen grab a list of processes before I rebooted - see attached.
I note that the CPU % on the process list his different from that shown in the GUI. However the unbelieveably slow loading of the gui (e.g. the console took nearly 2 minutes to appear), would suggest the CPU is maxed out.

Have you any idea what might be going on?