I flashed our legit F3 box via USB with the latest FW from Skybox.cc (23/12/2013) last Saturday and everything is fine so far.
I did try to use the LAN tool to update the channel list over wired connection recently, three times in fact, and it seems very temperamental. It worked the first time, however the second and third time it hung on 18%, the box restarted but was very glitchy and had factory reset itself i.e. Time/Network/Language/Line settings all reset.
I simply deleted all channels, performed a manual factory reset (I'd already taken a backup), rebooted, popped in the network settings and amended the other settings and rebooted, then did a blind scan, updated the channel list via USB and rebooted, then popped in my line manually, one more reboot and everything was hunky dory!
Sounds like a lot of work but took all of 5-10 mins.