My kids have the habit of pressing the big 'play/pause' button on the remote instead of using the small 'stop' button. This means Kodi is often left in a playback state so the display remains in HDR mode (albeit with the 'black' screensaver active) until hours later when I spot it and finally press 'stop' on the remote to end playback. Perhaps something similar is happening..
NB: That should have nothing to do with PM4K issues; that's something else, and no idea what without seeing logs of some kind.