Are you running Power Nap on battery? Also are you leaving USB items plugged in?
On Lion at least I noticed that if I left my USB HD in, and closed the lid on battery it killed it, every time. There was an Apple Support thread confirming that.
That could quite possibly be it, as I don't always unmount my fileservers when I leave home. I'll make sure to do that from now on, and might just write a script to handle it. Thanks.
I wonder if this same issue would crop up with the Amazon Cloud Drive.... It's not much more than a CIFS/NFS mount.
Nope, nothing plugged in. No power nap. WiFi is turned off.
I've got some time next week to look at it, and intend to get to the bottom of it. It's annoying to not be able to carry around a sleeping laptop for a day without it dying.
On Lion at least I noticed that if I left my USB HD in, and closed the lid on battery it killed it, every time. There was an Apple Support thread confirming that.