Sometimes when I go to watch cut scenes it is fine and sometimes not.

This morning for example I wanted to watch a cut scene from the DRK questline. They were all there 30 to 60. Went back later to so my wife one and only 50 55 and 60 were there. I noticed others vanish vanished too.

This has been happening a lot lately. Sometimes thwy are there and sometimes not. Is this a known bug?