3550xl keeps logging out

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All,

I have a 48 port, Cisco 3550 XL with the followinf IOS:-

IOS (tm) C3500XL Software (C3500XL-C3H2S-M), Version 12.0(5)XU, RELEASE
SOFTWARE (fc1)

The switch works fine, but what seems to happen when I'm logged into it
is that it logs me out every 30 seconds or so. It does this in telnet
mode, or even with the console. My exec-timeouts are 20 minutes, so I
know it's nothing to do with this. I tried upgrading the IOS but as the
switched logged me out, it stopped the upgrade.

Has anyone had any experinece of this?

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