I've seen other rports for the stand-still bug after she teleports, but I also see another new behavior for me that came together with this bug. On most days I disconnect midway killing my second ephenia. It's never the first time and always close to the end of the second run.
Still happening to me on the current patch. I have a GTX 1080 with 16GB of RAM, after she starts summoning multiple mobs and teleporting the game becomes unreadable (UI/game glitches out) and crashes soon after.