Solved: Computer shutdown problem

My computer automatically starts from a shutdown after about 30 minutes.

I think the problem started after a BIOS update (P8Z77-v).

I clicked Default in BIOS - no change.

Googling the problem, says to Disable Wake on Lan, but that is already unchecked in Dev Mgr and I can't find a setting in BIOS.

Any advice appreciated.

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