FreeBSD crashes

[n j]

Hello everyone,

I hope someone can help me. I have started to experience seemingly
random crashes causing FreeBSD to shutdown and power off the machine.
The only trace I can find as far as the reason for the crash is
concerned are the following excerpts from /var/log/messages:

Mar 23 11:52:36 myhostname kernel: <<22>N>NMIMN NIMIMII   IISISSSAAA
A  20,22 200E,0,I, S  EIEEASI ISAAS f Aff ff
Mar 23 11:52:36 myhostname kernel: f
Mar 23 11:52:36 myhostname kernel:
Mar 23 11:52:36 myhostname kernel: f<
Mar 23 11:52:36 myhostname kernel: 2<>2>
Mar 23 11:52:36 myhostname kernel: f
Mar 23 11:52:36 myhostname kernel:
Mar 23 11:52:47 myhostname syslogd: exiting on signal 15
Mar 23 13:04:32 myhostname syslogd: kernel boot file is /boot/kernel/kernel

Apr  1 12:46:11 myhostname kernel: <<22>>NNMMII  IISSANANM M II22
0I0,ISS, AA   EEIISSAA  220f0ff,f,
Apr  1 12:46:12 myhostname kernel:
Apr  1 12:46:12 myhostname kernel: E
Apr  1 12:46:12 myhostname kernel:
Apr  1 12:46:12 myhostname kernel: <<22>>EIISSAA  ffff
Apr  1 12:46:12 myhostname kernel:
Apr  1 12:46:21 myhostname syslogd: exiting on signal 15
Apr  1 12:54:00 myhostname syslogd: kernel boot file is /boot/kernel/kernel

The system is up-to-date 6.3-RELEASE-p1.

Does any of this garbage look familiar to anyone?

Thanks for any clues,
-- 
Nino