RH: system uptime changed without reboot

From: Bosco Tsang (cn649@torfree.net.eh)
Date: 03/08/02 

From: cn649@torfree.net.eh (Bosco Tsang)
Date: Fri, 08 Mar 2002 18:16:09 GMT

My RedHat 6.0 system's uptime suddenly changed, reported up 16 minutes
(but actually it's up for over a day), and there is no reboot taken
place. What happen? Why the uptime suddenly changed?