Sudden freezes FreeBSD at same time

[Frank]

Hi,

Today and yesterday I had a freeze of my production FreeBSD server at
exactly 11:18
I don't have any logs or crash dumps. Where can I look further to examine
the freezes?

I think it too coincidentaly that both freezes have occured at the same
time. At the time there's not any crontab line and process accounting
shows no abnormalities.

Can anyone help me out?

Thanks in advanced,

Frank de Bot