Bueno pues para quien le pueda valer, he encontrado esta informacion:

Hi Dorren



This issue appeared after an update in the FIRE STICK 4K ""MAX"" also with the last update, when play HDR10+ DOLBY VISION files with all the players we can install in firestick, PLEX VLC KODI MXPLAYER JUSTPLAYER EXOPLAYER ........etc. it's caused by the libvlc/exoplayer , the fire stick send a wrong HDR10+ signal to the TV, glitch after black screen with audio playing , Otherwise the FIRE STICK 4K "" NOT MAX"" with the last update the HDR10+ DELBY VISION play correctly with all players , the issue is in the MAX version only



AMAZON need really to fix this issue ASAP with one update of firestick



here is some topic talking about this problem in another forums



https://github.com/jellyfin/jellyfin...tv/issues/2630

https://www.reddit.com/r/PleX/commen..._black_screen/

https://forum.makemkv.com/forum/viewtopic.php?t=29757


Aqui teneis el enlace para quien lo quiera ojear:

https://www.amazonforum.com/s/questi...gLpESAV/detail