After the problematic nightly earlier this week, I played around with the update settings on the N2.
I have set it back to Auto and notify at the end, but the nightlies are not being auto downloaded and notify to reboot since. Currently on the 0311 nightly.
I had to copy KERNEL and SYSTEM from a previous nigtly after the problematic nightly messed up things, maybe that has something to do with it?
If you manually download the .tar file for the latest nightly and place it into the .update folder and reboot it may clear your issue. It has worked for me in the past.