Weird Time Problem on Sun 3800 running Solaris 8

I have a Sun 3800- 2 processors running Solaris 8 running this kernel
version: SunOS 5.8 Generic 108528-23 Jun 2003. The system has been
running for years with the same patches and running the same
applications, Oracle 9.2 and SeeBeyond 4.5.3. On July 5 it developed a
very strange problem. At about 5 minutes after the hour, the system
changes the time back by an hour! When we caught the problem on July
9, the system listed a date of July 5. We have checked all the cron
jobs, no changes; our development team has made no code changes. There
was nothing logged but a couple of complaints about the fact of the time
change, by a couple of apps including cron. We did not do the firmware
update recommended by Sun for the Date light Saving date changes.

Has anyone ever seen this happen? I had a person suggest that a failed
clock chip could cause strange problems. We rebooted the system and it
came up with the correct date and time but when the hour rolled over the
time rolled back!! It is consistent.

I'll be glad to send further details if you have ideas.
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