When you use a Surface RT 2 device, you are prompted to enter your BitLocker recovery key after you turn on or restart the device or you resume the device from the sleep state. These messages may be random or they may occur every time that you try to restore the device to operation.
To resolve this problem, install an update that is now available for the Surface RT 2 device. This update is available from Windows Update
Note This issue does not affect the Surface Pro 2. This update applies only to the Surface RT 2.