Official comment
Hi Henry,
It could be that you have an issue with your computer causing the audio issues, but I'd suggest you start by verifying that the XZ is NOT assigned as the Windows default audio device in the Sound settings. The next thing to check is the audio buffer size in the rekordbox preferences - you may want to increase the size. If you still have issues, please file an inquiry ticket here and our support team will gather some additional information to assist you in resolving this issue.