Hardware: Denon DJ Prime 4+
Firmware/OS Version: v5.0.1 (Official Release)
Media Sources: Internal/External SSD + Apple Music Streaming
Peripherals: SoundSwitch (Active Light Control via Engine Lighting)
Hi everyone,
I’m experiencing a severe workflow-breaking bug in the official v5.0.1 release on my Prime 4+. After a period of mixing under heavy load, the library UI freezes, the rotary select know doesn’t work anymore In a specific view and track loading gets corrupted.
I am NOT experiencing the known audio stutter issue, the audio output remains clean, but the OS control interface fails.
Steps to Reproduce / Context:
1. Running a 4-deck mix session.
2. Mixing tracks from a local hard drive (SSD) simultaneously with streaming tracks from Apple Music.
3. SoundSwitch (Engine Lighting) is actively running and controlling lights.
4. After some time, the main browse encoder wheel / rotary knob stops responding in the vertical waveform left/right library inbetween view (split view with waveforms on the sides). Tracks can then only be scrolled/selected via touchscreen. But the knob works in the other views!
5. Once this state occurs, trying to load a newly selected track into any deck fails. Instead of loading the new track, Engine OS repeatedly loads a specific older track that was loaded earlier in the session.
The main encoder should remain functional, and the decks should load the newly selected tracks instead of falling back to cached/previous track data.
Only a full reboot of the Prime 4+ hardware resolves the issue. This looks like a UI thread crash or memory leak related to the combination of streaming, local playback, and Engine Lighting.
