self-initiated shutdowns??

Hello together,

i noticed on a customers asatro fw some self-initiated shutdowns. Looking at all logfiles I can't see an user-initiated shutdown, neither with webadmin nor from console or ssh logins.
This happens nearly every one or two days and is not very productiv.

Are there possible reasons for asl to initiate a shutdown? May be an overload?

Did some one of you have similar problems?

Thanks in advance.

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