Do these playback issues only happen with “.mp4” files? Do you have any “.mkv” files to test. I had an issue with 2 particular .mp4 files, I would get a skip during playback when I upgraded to 9.2.6, 9.2.7 or CE 19. These files were perfect at 9.2.5. The skip always occurred in the same place, but it was a very rare occurrence.
There were 2 ways to fix it. The easiest was to use a free PC tool called “mkvmerge” to remux the .mp4 to an .mkv file - this only takes a few seconds per video. These mkv files playback perfectly with all releases. The second option was to make use of an “autostart.sh” file to set a particular value to 12 or 16 (your choice). The start of this thread is linked below. The second link details how remuxing from mp4 to mkv fixed it for me. Hope this helps in some way:-