Using ipad3, latest update of iOS. (9.1)
Premium CR member.
When playing back full length videos, (i.e. 24 minutes+/-) will freeze at nearly exactly the mid way point.
In order to restart, must hit the "done" button. Leave the video. Then click back on the video where it restarts from the midpoint. Then plays to end, no problem.
Occurs on more than half of videos watched.
Suspect video is stalling a point where a non paying viewer would get an ad.