I had the same rebooting problem which started around 3 weeks ago.
I did a factory reset and it seems fine now. After the factory reset, the weather app is missing, so I suspect it was the weather app causing the initial issue.
In order to do a factory reset, I disconnected my internet (I just unplugged my modem), as without an internet connection, the box still worked without the rebooting issue.
I suspect this is a global issue with these boxes as there’s another topic about this - the most recent comment on this page was posted a couple of weeks ago, which may be a better solution for you rather than factory reset - http://community.wd.com/t/wd-tv-live-suddenly-rebooting-when-network-cable-inserted/204662/6
