When the shriekers take the bosses shield off, dont damage the boss to the half way point until the shriekers close back up. If you damage him too fast, and his shield goes back up before the shriekers close back up, they wont open again to take his shield down. Hopefully they fix it, but it wont soft lock when done like that. Now, there is also another softlock that happens before the boss fight where after clearing the 3 areas of the ogres, it doesnt complete for some reason. It gets stuck at 2 of 3 areas cleared. Its happened 3 times to me so far. Not sure of the fix for that.