rekordbox doesn't work smoothly. E.g. playback stops frequently. Why is this happening?

There are 4 main factors that can cause this and there are 4 possible countermeasures:

■ Dust on the needle of a turntable when using DVS control
Dust may accumulate at the tip of the needle, resulting in sound skipping, etc. In this case, remove the dust from the tip of the needle.

■When the Windows built-in sound device setting is the cause
See case 4 in the troubleshooting guide [here].

■When the connection or other equipment is the cause
An unstable connection with your PC/Mac might cause this problem.
To solve this, shut down your PC/Mac and disconnect all other USB devices and USB hubs. Then, connect the DJM-S7 directly to a different USB port.

■When your system (PC/Mac) is the cause
Doing the following might solve the issue:
- Quit all other applications.
- Disconnect from the internet and exit security software.
- Turn off wireless connections such as Wi-Fi or Bluetooth.
- Turn off power-saving settings.

If your computer's system doesn’t meet the requirements of rekordbox, it might cause the issue. See details on system requirements [here].