Can't Fast Forward or Rewind or stop subtitles on .mkv files

Hi Guys,

I just re-jaibroke my aTV with Seasonpass and put aTV flash back on…both latest versions.  The reason I did this was I suddenly couldn’t fast forward or rewind through a movie, or even go in and switch the subtitles off in the media player app when playing .mkv files.   I have to press Menu and play to reboot the ATV and simply go back and watch the movie from start to finish with subtitles.

OR: if I leave the aTV long enough…it will hang…then reboot on its own.

Any fix for this? Media player doesn’t seem to like .mkv does it?

Thanks in advance!