Yeah, nothing works to fix this. I re-did a mission 3 times the other day, wasted over an hour before it let me finish. Today I did the Modremoth fight and it kicked me to character select as I was about to turn you know who into salad, and I was, still am absolutely livid I wasted all that time. I'm seriously considering asking for a refund, but this is just terrible. Not to mention the bugs that still exist from release because the devs want to line their pocket making new micro-transactions instead of actually fixing the game. Yes, I've submitted a ticket about, but no, no one has contacted me, but this comes back to the lining their pockets comment, it takes WAY to long to get a reply, and I'm 99% sure the reply will be trash and this issue won't be fixed.
Ya, totally still an issue. Though it's hardly a surprise. There are still bugs in this game from release and the customer service is awful so it's unlikely you'll see a fix or response for the next 5 years.