Pr Mobile playback artefacts with dlog and ProRes

hi, I'm having issues with playback of any video that isn't standard than before in the timeline, it will export okay, but the app is unusable as I cannot preview before rendering.

if I buy a LUT, the artefacts change but remain at that level. I've tried reinstalling the app and assuring that I'm running the latest version. I don't see any settings that can be adjusted, any idea and does anyone else have the same issue?