Watching the ending cut scene on Darkrime Delves and then after the "talk" I was kicked to character select. Now I have to start the whole thing over after 30 minutes because of no credit. There was no lag during the instance and nothing to indicate that it was coming. Cut scene disconnects are incredibly frustrating.
Some notes on my general connection:
1) I had average ping of 40 during the play session;
2) I have the fastest available internet in a major metropolitan area;
3) There were no indications whatsoever on my end that my service was interrupted.
This has been a long, long time issue. Anet, please look at the activity connection metric, process, whatever that gets suspended or downgraded or something during cut scenes. I suspect there is something flagging the player as idle or the connection is backseated or downgraded or something when a cut scene is being watched.