I’m having the same problem, but am also having it with automatic install of plug-ins.
Can you do auto-plug-in installs?
The plug in feature was working fine up until two days ago, now it acts the same way that the auto-upgrade does. I am still running 2.7.0 so I know that isn’t the issue.
I have not made any changes to my server, so that doesn’t seem to be the problem either.
If I view my server after initiating the auto install/upgrade I can see a file name show up, but it has a size of zero and eventually WP returns an error and aborts.
Any ideas…anyone?