Since yesterday a new update is available for the Microsoft Surface RT. Several improvements have been added, mainly concerning Wi-Fi.
Yesterday Microsoft has implemented several updates for Windows operating system, Office applications, but also firmware on the tablet which requires a reboot. From Microsoft forum, we learned that this update improves the reliability of Wi-Fi connectivity which sometimes was reducing performance of the tablet.
More specifically, it eliminate the few cases where Wi-Fi is limited to a restricted regarding connectivity. Performance-wise, it improves responsiveness when pressing the volume buttons on the tablet.