FreeBSD reboot problem

I run freeBSD on my server and I have a big problem. THe server often suddenly reboots. Just without any warning in the logs or what soever. It's very frustrating because it reboots about 10 times a day without chronological order.

And with every reboot the server is for 3 minutes unaccesseble.

Anyone know what it could be?! (my memory is fine, already checked that)

 

 

 

 

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