I believe it's just the server deciding to be grumpy again. If it's been happening for a few hours now, I'd scroll up to where you first signed in and click on 'Character Reset'. There, you can reset your character back to Lonely Cave and wait a few minutes, lingering into another map if you'd like, until the map you wish to go to has settled and works again. Merely be patient for the server likes to do this to us sometimes.