Hi. I recently bought an external keyboard for my ipad 1. Sometimes, when the pad was not restarted for a few hours, when plugging in to the keyboard the ipad locks up. When I restart the ipad before plugging in, there is no lockup. When the keyboard is plugged in an pad did not lock up, the keyboard is working perfectely. The lockup happens always, when the device was on for a few hours. Does anybody have a solution?