We had to restart Hel Ra twice the other day too, after the second time we gave up and called it a day.
Seriously, this game is getting more and more buggy with each "patch". It's getting annoying to the point where I think an extended break is in order.
The glitching of the "welwa" boss and having to restart the trial over is utter horse manure. Especially since your game is buggy as hell and 4 people get blue screened/frozen screens and fail that boss through no fault of their own and we have to start over... Come on... surely this is a VITAL fix??? No???