Recording playback in Chrome webapp seems to cut off and loop to beginning

I’ve recorded some TV shows and Worldcup matches on my Tablo 4 Tuner.

When I playback on Chrome, and use the slider to skip commercials/unwanted areas, I often find the playback terminates at about 80% of the timeline and then skips to the beginning.  Occasionally the length of time in the playback shortens dramatically when it loops back and only returns if I back out of the playback and restart.

If I play the same recording on a Roku (and make liberal use of the fast forward) everything plays back just fine.

(The roku is connecting wirelessly to my router, but the computer has a wired 1GbE to the same router as the Tablo.)