The final cut of the 9th episode of the Tesla Motors Club Podcast, featuring Chad Schwitters, the former president of Plug In America, is now available. You can watch it now on YouTube or listen to it on all major podcast networks.
Normally the solution is what you did. Reboot it.
If it occurs really frequently, I would bring it up to the SC. Not sure what they would do to fix it.
Mine freezes once in a while while trying to use the browser, and rarely when using NAV.