Hi. Being a latecomer to the smartphone party apologies if this topic has been answered before. I have an HTC Sensation but I am having problems with Facebook automatically unsyncing itself from my contacts, sometimes a few times in the same day. If I go into Settings>Account & Sync then Facebook has disappeared from the list so I have to open the app, go into Facebook settings and it will have set itself to "Do not sync contacts". Every time I rest the setting to sync with contacts it will eventually unsync them. Whilst this isn't a major problem it is REALLY annoying as I like having my contacts linked to Facebook. Also, sometimes it gives an error message along the lines of "HTC Sense Facebook authentication failed". Additional info: Using Facebook app not Facebook for HTC Sense. Android version 4.0.3 HTC Sense version 3.6 Any advice on a possible fix for this would be appreciated greatly.