The Microsoft Surface Pro 3 is now receiving a new firmware update which enhances the performance of the tablet, while improving its Wi-Fi connectivity. The update is being sent out in stages, so it may take awhile before it is available for your device.
You can manually check for the update by heading to Settings > Change PC Settings > Update and recovery > Check now > View details > Install.
You can manually check for the update by heading to Settings > Change PC Settings > Update and recovery > Check now > View details > Install.