Hi,
Unfortunatelly I have to report that in versions 4.4.0 and 4.5.0 this issue is back.
I just started a mix on Friday and in the second track the CUE fail, the falied again several other times during a 45 minutes session.
Below you can find my setup
Sérgio
OS version: Windows 10 x64
CPU: Intel Core i7 7700HQ 2.8GHz
RAM: 16 GB
Graphics driver: NVIDIA Gefore GTX 1050
Display resolution: 3840 x 2160
rekordbox mode: Performance
Plus Packs: DVS + Video
Model name of Pioneer DJ product used with rekordbox, Firmware/Driver version: DDJ RZX - Driver 1.021 - Firmware: 1.08