After running a firmware upgrade on my Archer C6 v2 I can no longer access the "Wireless" and "Guest Network" pages on the setup menu. Before they used to work fine, and every other page in the settings menu still opens fine, but both of the wireless settings pages only show the loading wheel indefinitely.

The menu also becomes unresponsive after trying to access either of the wireless settings pages and clicking anywhere else in the menu is disabled. The only way to return functionality to the menu is by refreshing the whole page, after which all other pages work fine again.