Problems with Z9X Pro: stuttering, dark picture, playback freeze, etc.

hi there, @mirror

I'm experiencing some major troubles with the z9x pro, latest firmware (using home theater app):

1. playback stops after 3 sec. -->need to exit movie and shutdown & reboot device. sometimes it works afterwards.
2. there is lots of motion judder if i use SPDIF audio (raw) with core mixdown option enabled
3. the picture of hdr-movies is very dark. Colors are not washed out, but everything gets very dimmed down.--> if i exit the movie and return to main menu of hometheater everything is bright and lit up again.
SD-movies and Dolby-Vision movies are OK but Not superbright...(htpc delivers perfectly bright picture of same movie though). HDR10(+) movies are way too dark!!!

is there a fix for this? will there be a new firmware soon?

regards