Official comment
Roger, it looks more to me like it's a performance issue with your laptop not having enough available resources for what's going on. Can you please ensure that you have closed and unloaded any unnecessary background tasks / applications, and disabled and rekordbox functions you're not using (such as lyric, video, lighting, DVS, etc).
If you're still having issues, please file an inquiry ticket here and our support team can dig further to assist you in resolving this issue.
Thanks.