I almost started a thread earlier this week on the timeout issue... I logged into the AC WIFI at SFO, shut down computer without logging out, and then tried to login when I landed at DFW... it was still logged in and would not let me use the service. I didn't have time to call T-Mobile and get manually "logged out" which I have done before. Would be great if it would sense 15 mins of inactivity and log us out automatically!