Asus is rolling out another bug-fixing update for Transformer Prime users in US. This update brings improved Wi-Fi and Bluetooth performance along with a new kernel for the tablet. It is rolling out now and you will soon get a notification on your Prime to download and install the update.
Build version is 18.104.22.168. There is no official change-log right now, but we will update the post if we get hold of one. You can go Settings > About tablet > System update to manually initiate the update process.