i have a focus and can tether easily, but after half an hour or so my netbook's connection disappears. i have to restart the phone and netbook to restore the connection, then it will happen again and again. i have ATT and have the grandfathered unlimited data plan, but wonder if they are seeing a lot of bandwidth being used and limiting my usage or if it's the fault of my focus losing a connection from extended use. does anyone have any opinions or experience with this?