Its very strange, I play through my timeline, and at the exact same point each time, playback stops (no in and out selected) without fail. I Have to scroll past the point each time to get it to play again. Any thoughts on why this may be happening?
I have had this happen occasionally when I have fast-imported ProRes into an Avid project, every once in a while a clip gets corrupted somehow and stops at the same point every time. The only workaround I ever found was to re-import the clip, not as a fast import, but as a full DNxHD145 import. Hope this helps.