Wake for network access keeps getting enabled by something

10.7.2 on a mac mini
Under prefs > Energy Saver I set  checked on all the checkboxes except Wake for network access
It's also scheduled to turn "Shut down" early evening and Start up or wake early morning.
However - when I check back later in the day - they are all checked including the Wake for network access.
I thought I was imagining this - so I ran thru it several times today - and yes - it's disabled - and then later its enabled.
Can't find out any pattern in the duration between but it keeps turning on.
(I'll also note that the scheduled shutdown does not work when a user is logged in - but I've read elsewhere that this is known).
All of this behaved on 10.6 - so it's a bit of a step back right now.
Any hints as to what is enabling wake for network access would be gratefully received

Do you connect via WiFi but still have an ethernet cable plugged in? I do... I'm wondering if this is the problem...
Try this (it's what I'm doing) - go to Preferences>Network
Make sure WiFi is at the top of the list (click the cog to reorder them)
See if that fixes it.
It's soooo annoying!

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