Facebook app authentication error

[teemuflash8]

Hi there. I Googled some facebook authentication error, I couldn't find anything to help. My problem is I have an HTC rezound and I have logged into facebook through the phone and synced it to contacts and have it linked to some games and whatnot. About once a day, there is an error saying facebook authentication failed. So I have click that and log in again. Not the end of the world, just a pain. Thank you!