TV-show MKVs stops playing

[oldjohn]

Hi UMS,

I am having a problem where TV-show MKVs stop playing (they just throw me back to the menu).
This never happens with movie MKV containers, only TV-shows.

Symptoms of attached trace debug:}
- I'm using WDTV as renderer
- The MKV starts playing just fine, but then throws me back to the menu at cirka 57 seconds
- When restarting playback and skipping ahead to about 2 minutes and 30 seconds, the rest plays just fine
- I have had this problem for as long as I can remember using UMS (2.x) to the current 3.3.0

At first I thought it was a problem with UMS, but then I started testing a bit. Apparently the exact same happens when playing the files in VLC.
Then I realized it may be because I use mkvtoolnix 6.3.0 to add the subtitle streams (.srt). I tested with the exact same file as above, only not having remuxed it, and it seems to play back fine in UMS and VLC.
But it's still something not making sense, because I mux a lot of movie MKVs too, to embed subtitles, with no problem playing the files - it only happens with TV shows.

Any ideas why this might happen?