I'm not sure whether that command does xbmc only or not. My addons are set to update automatically anyway. I only run update/upgrade whenever I feel like it. I don't want to fix what's not broken.
As for the file, what audio stream does it have? AC3? DTS? With the latter, [I think] you need a beefy machine to decode the audio. Even my HTPC has trouble with DTS-ES audio.
is there a way in the xbmc app for it to update itself automatically?
as for the file i had trouble with, I saw that there is a problem with some xvid or x264 files encoded in some type of 720p that xbmc stutters on. It looks like the newer builds havent fixed this yet so updating isnt as critical for me now