Okay…I went and checked it out.
It looks like a plugin called Post Type Switcher was switching my pages to posts during save, or auto-save.
So when I made a few changes to my home-page and saved, it converted it to a post, and therefore was no longer the front-page.
Disabled the plugin to prevent it from happening again. Went into my database and found my home page and changed the post_type field to page and my home-page was back.
This plugin must not work well with the recent WP 3.8 update.