So i was having issue with my favorites disappearing. It was a pain with my Favorite People widget. It has to do with your sync. To fix it, you have to go to the gmail website and add your favorites to the website. If you don't it will keep syncing your favorites with the site, thus the disappearing. I would think it should be a 2 way sync, but I guess not. Either that or this is a syncing bug. Hope that helps people who've experienced this.