[ubuntu] Server crashing after one hour uptime

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http://ubuntuforums.org – Hi, We've got an Ubuntu 11.10 server which we use for LAMP web development here in the office. A couple of times in the past, it's gone through a phase where it reboots after it's been up for one hour. It's not a specific minute within an hour - it's just after one hour of uptime. The last time this happened it seemed to fix itself after an apt-get update / upgrade on the installed packages. I've done this again just now and it doesn't seem to be helping. Still reboots. I can't use acpi to get any temperature readings as the machine either doesn't have sensors, or those it does have aren' (Hardware)