Many DJs plug in their hardware and expect it to work instantly via Plug-and-Play. While modern operating systems are intelligent, they are not infallible. Without the correct driver, your XDJ-RX3 might refuse to connect to Rekordbox, output distorted audio, or fail to recognize USB devices entirely.
Always download drivers directly from AlphaTheta, keep backups of known-good driver versions, and resist the urge to "update" a working system just because a new version appears. If it works, and latency is low, lock it in. Driver Xdj Rx3