Google's Browser Sync is eating my bookmarks!

I've now seen this behavior a couple of times on both Windows and Linux versions of Firefox. For some reason, unknown to me, Google's Browser Sync plugin gets a wild hair and deletes almost all of my bookmarks when synchronizing with the central server. This phenomena then proliferates out to the rest of my browsers when I use them. I've become very initimate with exporting my bookmarks frequently just so I have a backup. Kinda of aggravating. I hope they get that issue fixed at some point.