To give some more detail on this. There is a bug - *my* bug - on the gladiator card presentation screen. It will be fixed in the upcoming patch; it was already fixed before I saw this post, but I wanted both to comment and also ask for feedback on whether or not this fixes things. From reports internally, it doesn't *seem* to matter if OTHER people have the animated banner pose; only if you do; we had a group of other devs playing where 2 of 3 had animated poses - and both froze - but third with a rare pose did not; but that might just be luck. This makes me think it's not. But I'd love to get more feedback on if that's the case. Even if non-Epic poses trigger this, it seems to be much, much less often.
There's no obvious reason - looking at the code - why epic (animated) banner poses should trigger this more often - I never saw this bug in testing, nor did QA, but I know the bug is happening. And I can definitely believe this post - that epic banner poses are triggering this more often, because the bug is with a safeguard to make sure we don't try to run a pose on a character for which it doesn't apply. Maddeningly, it's not 100%. As others in this chat have said, it doesn't happen every time. And, again, we had no reports of this during testing.
Animated gladiator card FRAMES will NOT affect this; because it's not a problem to, theoretically, show a Revenant banner frame on a Lifeline; but it is a problem to try and run a Revenant animation (pose) on a Lifeline.
For this same reason, it also doesn't seem to trigger upon champion squad presentation, because even if they have epic banner poses, we just show the last frame as a static image.
I'm sorry for all the frustrations that folks have had with this patch. We're working hard to get things fixed, and hopefully things are already better thanks to some of the changes we've been able to make since Tuesday.
TL;DR - I believe there's merit to this. Please try it. And you should be able to go back to your animated poses once we patch. And thanks everyone for your patience.