Leviathan Head to Head Freezing

Yeah, I've had it happen to me ~2 times over the last 6 months or so. Always happened during the ult (can't remember whose ult it was, but I believe it was always the enemy ult), and I had to close the game. I have no idea what triggers it, but I'm assuming it has to be something very specific since it's a very rare occurance, at least from my experience, and most of the people I talked to about it. It seems to happen on all kinds of devices (new and old) so I doubt that hardware is the problem.