Checking the Nook site, two bits of information became apparent:
- Many other Nook users are having this problem, see the thread here: bookclubs.barnesandnoble.com/t5/NOOK-Technical-Sup...
- This problem is related to the 1.1.0 update released this week. The update is being rolled out as an automatic download to all Nook users "over the coming weeks and automatically install when the device is idle."
It looks like they're working on a fix... and when that comes out, you'll have to sideload it, of course. You can probably do that here, once the file has been updated: www.barnesandnoble.com/u/Software-Updates-NOOK-Sim...
Are you having problems with the WiFi this week? Have you found a reliable workaround in the mean time?