FLX4 and Rekordbox Android Mobile distorted sound

I'm having issues with Rekordbox Mobile on a Samsung Galaxy A8 Android 13 paired with an flx4. The sound output is really distorted, noisy, glitchy and odd sounding. The FLX4 also behaves very strangely at times. Tempo slider is temperamental, some hot cue buttons illuminate but not all etc etc. I've experimented with mono/stereo, different buffer sizes. It sounds fine and behaves normally using the FLX4 with a laptop and with a Google Pixel 5 Is this a known issue and are there any solutions?